106 LEGUMIN OSiE. (PULSE FAMILY.) 
and spreading, with their claws united to the top of the sheath of 
filaments, alternate with the anthers ; the fifth (standard) inserted 
on the bottom of the calyx, heart-shaped or oblong, folded. Sta¬ 
mens 5, monadelphous, the tube cleft. Pod membranaceous, in¬ 
closed in the calyx, indehiscent, 1-seeded. — Chiefly perennial 
herbs, upright, dotted with glands, with odd-pinnate leaves, mi¬ 
nute stipules, and small flowers in very dense terminal and pedun- 
cled heads or spikes. (Name combined of the two Greek words 
for petal and stamen, alluding to their peculiar union in this ge¬ 
nus.) 
1. I*, violaceiim, Michx. Smoothish ; leaflets 5, linear; 
heads globose-ovate, or oblong-cylindrical when old ; bracts pointed, 
not longer than the silky-hoary calyx; corolla violet-purple or red- 
purple. — Dry prairies, Michigan and Wisconsin. July. — Leaves 
crowded or clustered, small. 
2. P. candid inn, Michx. Smooth; leaflets 7-9, lanceo¬ 
late or linear-oblong; heads oblong, when old cylindrical; bracts 
awned, longer than the nearly glabrous calyx ; corolla white. — Wifl" 
consin, with No. 1. — Leaflets 1' long. 
20. TBIFOLIUM, L. Clover. Trefoil. 
Calyx persistent, 5-clefl, the teeth bristle-form. Corolla wither¬ 
ing or persistent, the petals all somewhat coherent below : stand¬ 
ard longer than the wings, these mostly longer than the keel. 
Pods small and membranous, often included in the calyx, 1-6" 
seeded, indehiscent, or opening by one of the sutures. — Tufted 
or diffuse herbs. Leaves mostly palmately 3-foliolate : leaflets 
often toothed. Stipules united with the petioles. Flowers chief¬ 
ly in heads or spikes. (Name from tres , three, and folium, a 
leaf.) 
* Corolla purple or purplish , deciduous or withering: flowers sessile in 
compact heads. 
1‘ WVeuSe, L. (Rabbit-foot Clover.) Silky, branching> 
leaflets obovate-linear or narrowly wedge-form, minutely 3 -toothed at 
the apex; calyx-teeth longer than the corolla , plumose-woolly ; heads ob¬ 
long and cylindrical. ©—Old fields, naturalized. — Plant 
high ; the corolla whitish with a purple spot; the heads becoming 
grayish and very softly woolly. 41 so called Stone Clover. 
^prat^nse, L. (Red Clover.) Stems ascending, some¬ 
what hairy; leaflets oval or obovate, often notched at the end and 
marked with a pale spot; stipules broad , bristle-pointed ; heads ovate. 
