LBGUWKOa.fi. (PULSE FAMILY.) 99 



purple flowers ; standard shorter than the keel ; joints of the pod 3 or 4, smooth, 

 reticulated. '4 — Mountain above Willoughby Lake, Vermont, Wood; and St. 

 Johns's River, Maiue, Goodale. Also northward. 



17. DESMODIUM, DC. Tick-Trefoil. 



Calyx usually more or less 2-lipped. Standard obovate : wings adherent to 

 the straight or straightish and usually truncate keel, by means of a little trans- 

 verse appendage on each side of the latter. Stamens diadelphous, 9 & 1, or 

 monadelphous below. Pod flat, deeply lobed on the lower margin, separating 

 into few or many fiat reticulated joints (mostly roughened with minute hooked 

 hairs by which they adhere to the fleece of animals or to clothing). — Perennial 

 herhs, with pinnately 3-foliolate (rarely 1-foliolate) leaves, stipellate. Flowers in 

 axillary <>r terminal rao mes, often panicled, and 2 or 3 from each bract, purple 

 or purplish, often turning green in withering. Stipules and bracts scale-like, 

 often striate. (Name from 8eau6s, a bond or chain, from the connected joints of 

 the pods.) 



$ 1. Pod raised on a stalk [stipe) mam/ times longer than the slight!// toothed calyx 

 and nearly as Ion;/ n* the pedicel, straightish on tin: upper margin, deeply sinuate on 

 the lower ; the I -4 joints mostly half-olio <<n the. bark : Stamens mono- 



ddphous b Ion-: plants nearly glabrous : stems erect or ascending: raceme terminal, 

 panicled: stijmhs bristle-firm, deciduous. 



1. D. lllHtiudl'um, DC. Leaves all croicdal at the summit <»/" the sterile 

 stems; leaflets broadly ovate, bluntish, whitish beneath; raceme elongated, on a 



prolongxi ascending / talk or scape from the runt, 2° long. — Dry woods ; 



common. Aug. 



2. D. acuminatum, DC Leaves aU crowded at the summit of the stem, 

 from which arises tlu - I naked raceme or panicle ; leaflets round-ovate, taper- 

 pointed, green both sides, the end one round (4' -5' Ion.'). — Rich woods. July. 



3. E>. paucillorum, DC. Leaves scattered along the low (8*- 15' high) 

 ascending stems; leaflets rhombic-ovate, bluntish, pale beneath; raceme feu* 



Jlowered, terminal. — Wood-, W. New York and Penn. to Illinois and south- 

 ward. Aug. 



§2. Pal short-stalked, of 3-5 joints: calyx-teeth longer than the iulie: stipules 

 ovate, striate, pointed, persistent: stems prostrate: racemes axillary and terminal, 

 small, scarcely panicled, 



-i. D. lllllllif US U 111, Beck. Smoothish; leaflets ovate or oval; stipules 

 ovate-lanceolate : pods slightly sinuate along the upper margin, the joints obtusely 

 triangular. — Woods, E. Massachusetts and Pennsylvania, rare. Aug. — Re- 

 sembles the next. 



5. D. rotUIKlifulium, DC. Hairy all over; leaflets orbicular, or tho 



odd one slightly rhomboid ; stipules large, broadly ovate ; pods almost equally 

 sinuate on both edges; the joints rhomboid-oval. — Dry rocky woods. Aug. 



§ S. Pod slightly if at all stalked in the calyx ; the teeth of the latter longer than tht 



tube : racemes panicled 



