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Key to Thaspium
https://fsus.ncbg.unc.edu/main.php?pg=show-key.php&keyid=40686
1 Leaves simple, 3-foliolate, or 2-3-ternate, the final leaflets or segments > 5 mm wide; petals yellow, maroon, or pale yellow. | |
5 Stem leaves 2-3-ternate, puberulent on the lower surface on the veins and blade surface; corolla pale yellow to creamy white; peduncles and umbel rays scabrellous on their upper surfaces; fruits scabrellous between and sometimes on several wings; mature fruit 4-5 mm long | |
4 Leaflets finely to coarsely serrate, but not lacerate or incised, few if any of the teeth > 2 mm long as measured on the shorter side; leaflet margins glabrous and hyaline-whitened; umbel rays mostly either more in number (than 8-10) or longer (than 3.5 cm long); petals golden yellow; plant glabrous. | |
6 Teeth of the leaflets coarse, averaging (1-) 2-3 (-4) per cm of margin, acute to obtuse (the 2 sides making an angle of about 90 degrees); umbel rays 4-10 (-12), the longest to 11 cm long in fruit (some on a plant at least 5 cm long); basal leaves 3-5 (-7)-foliolate, the leaflets mostly rounded to obtuse at the apex; fruit 1-1.5× as long as wide | |
3 Basal leaves simple or 3-foliolate (with 1-3 leaflets). | |
8 Teeth relatively acute, without a well-developed callous tip and a thickened, translucent border (use 10× magnification); lower portion of stem puberulent, the upper nodes also usually puberulent (use 10×); leaf margins often ciliolate; umbel rays 7-15; flowers golden yellow | |