174 LEGUMINOS^. Phaca. 



diameter ; the dorsal suture slightly, the placental suture rather deeply introflexed, so that 

 the fruit is imperfectly 2-celled. Seeds numerous, small. 



Gravelly banks of rivers and lakes ; also in sandy woods. Western part of the State, from 

 the Onondaga Lake to the Falls of Niagara. Fl. June - July. Fr. August. This plant, 

 which is by no means rare in our State, and which occurs also in Ohio and Wisconsin, was 

 discovered about twenty-five years ago by William Cooper, Esq., but was never described 

 till lately. In flower it strongly resembles Astragalus Canadensis, but can be known by its 

 shorter and looser spikes, white corolla, and by the nearly campanulate, not tubular calyx. 

 In fruit they are easily distinguished. 



Tribe VI. HEBYSAREjE. DC. 



Corolla papilionaceous. Stamens either monadelphous or diadelphous (9^1, or 5 <^ 5). 

 Legume {loment) transversely divided into several indehiscent one-seeded joints, occa- 

 sionally reduced to a single one-seeded cell. Embryo mostly with foliaceous cotyledons: 

 radicle incurved, rarely almost straight. — Herbs or shrubs. Leaves abruptly or un- 

 equally pinnate, orpinnately 2 - 3-foliolate, rarely palmately 2 - 5-foliolate, occasionally 

 reduced to a single leaflet, often stipellate. 



16. STYLOSANTHES. Swartz; Torr. ^ Gr.fi. N. Am. l.p. 354; Endl. gen. 6606. 



PENCIL-FLOWER. 



[ From the Greek, stylos, a column, and anttios, a flower ; the long narrow calyx-tube appearing to support the flower.] 



Flowers of two kinds intermixed ; the one kind complete, but sterile ; the other destitute of 

 cal3rx and corolla, and fertile. Sterile fl. Calyx somewhat bilabiate, with 2 bracteoles 

 at the base; the tube long and slender: upper lip 2-cleft; lower lip 3-cleft. Corolla 

 inserted in the throat of the calyx : vexillum broad : keel cymbiform, small. Stamens 

 monadelphous : anthers alternately linear and ovate. Ovary sessile, with 2-3 ovules, 

 always sterile : style filiform, very long : stigma capitate, minute, smooth. Fertile fl. 

 consisting of a sessile ovary between 2 bracteoles. Stamens none. Style short and re- 

 curved. Legume 1 - 2-jointed ; the upper joint ovoid, acuminate and uncinate with the 

 persistent style ; the lower joint often abortive, and resembling a stipe. Seeds ovate. 

 Cotyledons thick. Embryo curved or nearly straight. — Small herbaceous or sufTruticose 

 plants. Leaves pinnately trifoliolate. Stipules adnate to the petiole, and sheathing. Spikes 

 few-flowered, terminal, imbricated with stipules and hispidly ciliate bracts. 



1. Stylosanthes elatior, Swartz. (Plate XXVII.) Pencil-Jhwer. 



Stem herbaceous, erect or procumbent, pubescent on one side ; leaflets lanceolate, smooth ; 

 spikes few-flowered; bracts lanceolate, and, as well as the uppermost leaflets, spinulose- 



