| 1 |
Perennials. |
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(2) |
| + |
Annuals. |
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(5) |
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| 2 (1) |
Corolla lobes broadly obovate, to 1 cm wide, apex rounded; calyx lobes apically subrounded. |
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(3) |
| + |
Corolla lobes narrowly oblong, elliptic, or elliptic-lanceolate, to 0.6 cm wide, apex obtuse; calyx lobes apically obtuse or acute. |
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(4) |
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| 3 (2) |
Stem leaves more than 1 pair; flowers always erect, in a 2-6-flowered terminal racemelike inflorescence |
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2 Lomatogonium oreocharis |
| + |
Stem leaves absent or reduced to 1 pair; flowers usually nodding at anthesis, solitary or rarely with 1 or 2 additional axillary flowers |
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3 Lomatogonium stapfii |
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| 4 (2) |
Corolla dark blue, without lines, lobes narrowly oblong; stem leaves oblong-spatulate to oblong, base obtuse; stem simple |
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1 Lomatogonium perenne |
| + |
Corolla pale blue, with distinct deep blue lines, lobes elliptic-lanceolate to elliptic; stem leaves lanceolate to broadly lanceolate, base subamplexicaul; stem fastigiate branched from base |
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4 Lomatogonium longifolium |
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| 5 (1) |
Nectaries without a raised margin, yellow; corolla white; stem branched only apically |
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16 Lomatogonium micranthum |
| + |
Nectary with a lamellate margin, white; corolla pale blue to blue-purple (white tinged blue in L. forrestii var. bonatianum); stem often branched from base and sometimes at middle, rarely simple. |
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(6) |
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| 6 (5) |
Calyx and corolla tubes distinct, (1.5-)2-3 mm; ovary ovoid-ellipsoid; marginal lamellae not connate. |
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(7) |
| + |
Calyx and corolla tubes indistinct, 1-1.5 mm; ovary not ovoid-ellipsoid; nectary base connate into a tube pointed outward. |
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(10) |
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| 7 (6) |
Anthers 1-1.5 mm, ovoid, yellow |
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13 Lomatogonium brachyantherum |
| + |
Anthers 1.5-2.5 mm, ellipsoid, blue. |
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(8) |
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| 8 (7) |
Calyx lobes obovate-spatulate, base narrowed, sinus between lobes rounded |
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15 Lomatogonium chumbicum |
| + |
Calyx lobes linear or ovate-oblong to narrowly ovate, base not narrowed, sinus between lobes acute. |
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(9) |
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| 9 (8) |
Stem leaves obovate; calyx lobes ovate-oblong to narrowly ovate |
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14 Lomatogonium gamosepalum |
| + |
Stem leaves and calyx lobes linear |
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12 Lomatogonium zhongdianense |
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| 10 (6) |
Apex of stem leaf blades acute to obtuse. |
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(11) |
| + |
Apex of stem leaf blades acuminate. |
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(13) |
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| 11 (10) |
Calyx lobes ovate to elliptic or rarely lanceolate; basal leaves short petiolate |
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5 Lomatogonium carinthiacum |
| + |
Calyx lobes ovate-lanceolate or linear to linear-lanceolate; basal leaves sessile. |
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(12) |
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| 12 (11) |
Inflorescences racemelike, usually in many-flowered panicles; calyx lobes ovate-lanceolate; stem leaf base rounded to subcordate |
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6 Lomatogonium bellum |
| + |
Inflorescences cymose, few flowered; calyx lobes linear to linear-lanceolate; stem leaf base obtuse |
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7 Lomatogonium macranthum |
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| 13 (10) |
Corolla lobes to 2.5 cm; calyx as long as or slightly shorter than corolla |
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9 Lomatogonium rotatum |
| + |
Corolla to 1.6(-1.8) cm; calyx 1/2-2/3 as long as corolla. |
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(14) |
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| 14 (13) |
Stems 2-7 cm, simple or few branched; leaf blade papillose; pedicel filiform; corolla lobe apex acute to obtuse; calyx lobes with a black margin |
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11 Lomatogonium sikkimense |
| + |
Stems 12-40 cm, much branched; leaf blade not papillose; pedicel linear; corolla lobe apex acuminate; calyx lobes without a black margin. |
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(15) |
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| 15 (14) |
Stems and pedicels glabrous; leaf blade lanceolate to elliptic |
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8 Lomatogonium forrestii |
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Stems and pedicels densely papillose; leaf blade linear |
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10 Lomatogonium lijiangense |
