| 1 |
Corolla 9-12 mm long. Calyx lobes 3-5 mm long |
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(2) |
| + |
Corolla up to 4 mm long. Calyx lobes c. 1.5 mm long |
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(3) |
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| 2 (1) |
Nutlets 8-10 mm long. Throat scales of corolla crescent-shaped, apex bilobed |
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1 Mattiastrum asperum |
| + |
Nutlets 6-7 mm long. Throat and scales of corolla oblong |
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2 Mattiastrum karakoricum |
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| 3 (1) |
Basal leaves (90-) 100-130 x 25-40 mm ovate to obovate |
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5 Mattiastrum thomsonii |
| + |
Basal leaves smaller, oblanceolate to oblong-spathulate |
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(4) |
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| 4 (3) |
Wing of nutlets with teeth not glochidiate at margin |
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6 Mattiastrum tibeticum |
| + |
Wing of nutlets with teeth glochidiate at the margin |
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(5) |
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| 5 (4) |
Basal leaves few, 1-2, 8-15(-17) x 1.5-2 mm. Nutlets 2-4 mm long |
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7 Mattiastrum bungei |
| + |
Basal leaves many, 40-90 x 5-16 mm. Nutlets 5-8 mm long |
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(6) |
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| 6 (5) |
Plants with suberect hairs only. Fruiting pedicels 3-6 mm long. Style 1.5-2.mm long |
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4 Mattiastrum howardii |
| + |
Plants with both appressed and subpatent hairs. Fruiting pedicels 1-2 mm long. Style up to 1 mm long |
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3 Mattiastrum himalayense |
