| 1 |
Plants apparently almost stemless with a rosette of leaves flat on ground and a very dense central cluster of flowering branches; nutlets with glochids |
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29 Microula tibetica |
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Plants with normal stems, stem leaves, and laxer inflorescences; nutlets without glochids. |
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(2) |
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| 2 (1) |
Nutlets long turbinate, abaxial aperture orbicular, at apex of nutlets |
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23 Microula turbinata |
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Nutlets ovoid. |
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(3) |
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| 3 (2) |
Abaxial aperture of nutlets deltate or triangular, with a membranous emergence inside margin, attachment scar at base adaxially. |
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(4) |
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Abaxial aperture of nutlets oblong, elliptic, to orbicular, without emergence inside margin, sometimes abaxial aperture absent. |
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(7) |
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| 4 (3) |
Plants not bristly; corolla limb 5-8 mm wide, tube 2-4 mm; abaxial aperture of nutlets deltate, 0.7-1 mm. |
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(5) |
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Stems and leaves bristly; corolla limb 2-3 mm wide, tube 1-1.8 mm; abaxial aperture of nutlets triangular, 0.9-1.5 mm. |
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(6) |
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| 5 (4) |
Stems densely hispid; leaves and calyx hirsute; inflorescences short, crowded; pedicel ca. 1 mm |
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24 Microula longituba |
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Stems short strigose; leaves and calyx short strigose; inflorescences with many branches, widely spaced; pedicel 1-2.5 mm |
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25 Microula floribunda |
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| 6 (4) |
Leaf blade spatulate-linear to linear, 2-7 mm wide, abaxially with few bristles along midvein only |
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26 Microula stenophylla |
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Leaf blade narrowly oblong to oblanceolate, 5-15 mm wide, short strigose, abaxially with scattered bristles |
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27 Microula diffusa |
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| 7 (3) |
Attachment scar of nutlet apical. |
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(8) |
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Attachment scar of nutlet basal to middle adaxially. |
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(9) |
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| 8 (7) |
Stems 15-45 cm, bristly; bracts to 2 mm; abaxial aperture of nutlets frequently occupying entire abaxial surface |
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22 Microula trichocarpa |
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Stems 3-7 cm, pubescent; bracts of inflorescences 3-8 × 3-6 mm; nutlets without abaxial aperture |
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28 Microula tangutica |
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| 9 (7) |
Nutlets slightly bilaterally compressed, without abaxial aperture |
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21 Microula efoveolata |
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Nutlets ± dorsiventrally compressed, with abaxial aperture. |
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(10) |
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| 10 (9) |
Nutlets glabrous, slightly shiny, black spotted |
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20 Microula leiocarpa |
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Nutlets tuberculate or wrinkled. |
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(11) |
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| 11 (10) |
Stems bristly. |
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(12) |
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Stems hispid or glabrous or nearly so. |
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(20) |
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| 12 (11) |
Basal and lower stem leaves with base rounded to broadly cuneate, abruptly constricted into a petiole. |
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(13) |
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Basal and lower stem leaves with base attenuate to cuneate. |
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(14) |
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| 13 (12) |
Corolla limb 5-9(-11) mm wide |
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8 Microula sikkimensis |
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Corolla limb ca. 2.5 mm wide |
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9 Microula blepharolepis |
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| 14 (12) |
Corolla limb pubescent outside; nutlets ca. 3 mm, abaxial aperture ca. 2.2 mm |
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7 Microula forrestii |
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Corolla limb glabrous outside; nutlets less than 2.6 mm, abaxial aperture usually less than 1 mm (ca. 2.2 mm in M. involucriformis). |
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(15) |
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| 15 (14) |
Terminal inflorescences closely subtended by 2 bractlike leaves 1.5-3.5 cm; bracts 4-7 mm; nutlets ca. 2.6 mm, abaxial aperture ca. 2.2 mm |
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10 Microula involucriformis |
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Terminal inflorescences subtended by 1 leaf, if 2 then not adjacent, or smaller than 1 cm; bracts extremely small, nutlets less than 2 mm, abaxial aperture less than 1 mm. |
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(16) |
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| 16 (15) |
Corolla limb 3.8-5.5(-9) mm wide. |
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(17) |
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Corolla limb 2-3 mm wide. |
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(18) |
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| 17 (16) |
Leaf blade mostly elliptic, to 2.7 cm; corolla limb ca. 5.5 mm wide |
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2 Microula muliensis |
| + |
Leaf blade lanceolate to oblong, to 5.5 cm; corolla limb 3.8-9 mm wide |
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13 Microula pseudotrichocarpa |
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| 18 (16) |
Upper stem leaves elliptic to oblong, 0.5-1.5 cm; corolla blue |
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3 Microula pustulosa |
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Upper stem leaves oblong to lanceolate, 1-6 cm; corolla white or with light yellow throat. |
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(19) |
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| 19 (18) |
Stem leaves oblong, 1-2.2 cm; stems to 11 cm tall; corolla white |
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15 Microula polygonoides |
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Stem leaves narrowly lanceolate to narrowly oblong, 1.5-6 cm; stems ca. 5 cm tall; corolla light blue with light yellow throat |
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18 Microula hispidissima |
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| 20 (11) |
Basal part of stem glabrous or nearly so. |
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(21) |
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Basal part of stem ± hispid. |
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(24) |
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| 21 (20) |
Petiole of lower stem leaves long; leaf blade ovate, cuneate-orbicular to cordate-cuneate at base; pedicels of lowermost flowers 2-4 cm |
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6 Microula longipes |
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Petiole of lower stem leaves less than 3 cm; leaf blade broadly cuneate to attenuate at base; pedicels of lowermost flowers less than 2(-3.2) cm. |
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(22) |
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| 22 (21) |
Plants sparsely pubescent; leaves glabrous abaxially; pedicel 0.8-1 mm; calyx glabrous outside; nutlets ca. 3 mm, abaxial aperture ca. 2.8 mm |
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19 Microula rockii |
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Plants hispid; leaves pubescent on abaxial surface; pedicel 8-32 mm; calyx pubescent outside; nutlets less than 2.7 mm, abaxial aperture 0.6-2.5 mm. |
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(23) |
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| 23 (22) |
Stem leaves elliptic to narrowly ovate, short strigose; pedicel 1-3.2 cm; calyx densely short strigose; corolla limb 3-4 mm wide; abaxial aperture of nutlets 1.5-2.5 mm |
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5 Microula bhutanica |
| + |
Stem leaves narrowly oblong to narrowly elliptic, glabrous or sparsely short strigose abaxially; pedicel to 0.2 cm; calyx pubescent along midvein; corolla limb 5-7 mm wide; abaxial aperture of nutlets ca. 0.6 mm |
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14 Microula oblongifolia |
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| 24 (20) |
Stem leaves elliptic to narrowly ovate. |
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(25) |
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Stem leaves spatulate or oblanceolate. |
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(27) |
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| 25 (24) |
Aperture of nutlets at apex of abaxial surface |
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1 Microula ovalifolia |
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Aperture of nutlets at middle of abaxial surface. |
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(26) |
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| 26 (25) |
Stems spreading hispid or bristly, 11-19 cm; nutlets 1.6-1.8 mm, abaxial aperture 0.7-0.9 mm, attachment scar near base |
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2 Microula muliensis |
| + |
Stems densely short hispid, to 8 cm; nutlets ca. 1.5 mm, abaxial aperture ca. 0.5 mm, attachment scar at middle on adaxial surface |
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4 Microula myosotidea |
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| 27 (24) |
Flowers in spikelike branches, with distinct bracts; bracts leaflike, oblong, 3-9 mm |
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17 Microula younghusbandii |
| + |
Flowers few, forming short crowded inflorescences, with obscure bracts. |
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(28) |
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| 28 (27) |
Stems to 5 cm. |
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(29) |
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Stems more than 12 cm. |
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(30) |
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| 29 (28) |
Leaf blade spatulate, 1.4-4.5 cm × 3.5-8 mm; corolla limb 3-3.5 mm wide |
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16 Microula spathulata |
| + |
Leaf blade narrowly oblong to narrowly oblong-oblanceolate, 0.7-1.9 cm × 2-4 mm; corolla limb 2-2.5 mm wide |
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17 Microula younghusbandii |
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| 30 (28) |
Stems with solitary leaf-opposed flowers at branching points above middle |
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12 Microula ciliaris |
| + |
Stems without solitary leaf-opposed flowers. |
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(31) |
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| 31 (30) |
Corolla limb ca. 2 mm wide, appendages lunate, ca. 0.2 mm; nutlets ca. 2.4 mm, abaxial aperture ca. 1 mm, attachment scar near base |
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11 Microula jilongensis |
| + |
Corolla limb 5-7 mm wide, appendages nearly trapeziform, ca. 0.5 mm; nutlets ca. 1.8 mm, abaxial aperture ca. 0.4 mm, attachment scar at middle or below on adaxial surface |
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14 Microula oblongifolia |
