DIADELPHIA DECANDRIA 41 1 



3. Hbdysarum Tribe. Stamens mostly united by the filaments. Legume with 

 transverse articulations forming 1-seeded cells, or lenticular and 1-sceded. He- 



DYSARE33. DC. 



341. STYLOSANTHES. Sivartz. J\Tutt. Gen. 605. 

 [Greek, Stylos, a column, and Anthos, a flower ; the flowers appearing stipitate.] 



Calyx with a long slender tube ; limb 5-parted ; segments unequal. 



Corolla inserted on the throat of the calyx ; keel small, bifid at apex. 

 Stamens submonadelphous, with the tube slit. Ovary sessile ; sttjle 

 long, straight, filiform ; stigma capitate, hispid. Legume 1 -celled, or 

 articulated and 2-celIed, the apex sub-uncinate with the recurved base 

 of the style. 



1. S. klatior, Sw. Stem herbaceous, erect, pubescent on one side; 

 leaves trifoliate; leaflets lanceolate, acute, smooth; spikes few-flowered ; 

 bracts lanceolate, hispid-ciliate. Beck, Bot.p 83. 

 S. hispida, var. nudiuscula. Mx. Am. 2. p. 75. var, crecta. Pursh, 

 Am. 2. p. 4S0. Not S. hispida of Per*. 



Tallkr Stylosantiies. Vulgo — Pencil Flower. 



Root perennial. Stem 9 to 15 inches high, somewhat branched above, often sev- 

 eral from the root, slender, firm, terete, marked wiih a broadish alternating pu- 

 bescent line, the branches at summit hispidly pilose. Z,cr//fo/s 3 fourths of an inch 

 to an inch and quarter long, and 1 eighth to 1 third of an inch wide, rugose-dot- 

 ted beneath, subscssilc ; commm petiole 1 fourth to half an inch long, pubescent; 

 stipules sheathing the stem, nerved, pubescent, adnata to the common petiole, with 

 a free subulate-linear acumination. Flowers in small terminal clusters, invested 

 with hispid-ciliate bracts which arc trifoliate, or triful and membranaceous. Calyx 

 with the limb unequally 5-cleft, the 2 upper segments broader, more obtuse, and 

 less deeply cleft ; the tube long and slender, giving the flower a stipitale appear- 

 ance. Corolla bright yellow, inserted at the throat of the calyx-tube. Legume 

 somewhat obovoid and 1-celled, or often articulated in the middle and 2-celled, 

 thickish and suberose, nerved and veined, pubescent, slightly compressed, with 

 a keel-like suture at each margin, and a short abrupt oblique acumination, with 

 the point uncinately recurved. 



Hab. North hills of the Great Valley: not common. Fl. July-Aug. Fr. Sept-Octo. 



Obs. The only species known in the U. States. There is a procumbent variety, 



very common in New Jersey ; but I have not seen it on this side of the Delaware. 



342. DESMODIUM. Desv. DC. Prodr. 2. p. 325. 



[Gr. Desmos, a chain, and eidos, form ; the articulated pods resembling a chain.] 



Calyx mostly 5-cleft, sub-bilabiate ; upper lip bifid, lower one 3-parted. 



Vexillum suborbicular ; keel obtuse, not truncate ; -wings a little longer 

 than the keel. Legume mostly with several joints, compressed, mem- 

 branaceous or coriaceous, tenaciously hispid ; joints 1-secded, separa- 

 ting at maturity, scarcely dehiscent. Leaves trifoliate ; Jiotvcrs mostly 

 racemose ; pedicels in 2's, or 3's, with unequal bracts at base. 



1. D. pakiculatux, DC. Stem erect, smooth; leaflets oblong-Ian- 

 ceolate, rather obtuse, smoothish; stipules subulate ; panicle terminal ; 

 legumes with 3 or 4 sub-rhomboid pubescent joints. Beck, Bot. p. 



