312 PAPILIONACEAE. [Von. IT. 
1. Aeschynomene Virginica (IL.) B.S.P. 
Sensitive Joint Vetch. (Fig. 2167.) 
Hedysarum Virginicum I. Sp. Pl. 753+ 
750. 17, 
AEschynomene hispida Willd. Sp, Pl. 3: 1163. _ 1800. 
By elie ee Virginica B.S.P. Prel. Cat. N. Y. 13. 
1888. 
Annual, herbaceous, branched, erect, rough-pubes- 
cent or glabrate, 2°-5° high. Stipules membranous, 
ovate, acuminate, 3//-4’’ long, deciduous; leaves 
short-petioled; leaflets 25-55, oblong, linear-oblong 
or oblanceolate, obtuse at the apex, narrowed or 
rounded at the base, 3’’-9’’ long; somewhat sensi- 
tive; flowers few, reddish-yellow, about 5/’ long; 
petals veined; pod linear, 1/-214’ long, 3’’ wide, 
sparingly tuberculate or glabrous, of 5-10 nearly 
square easily separable joints. 
River banks, southeastern Pennsylvania, southwest- 
ern New Jersey to Florida, west to Louisiana. Called 
also Bastard Sensitive Plant. Aug.—Sept. 
32. STYLOSANTHES Sv. Prodr. Fl. Ind. Oce. 108. 1788. 
Perennial herbs, mainly with villous or viscid pubescence, 3-foliolate leaves, and yellow ter- 
minal or axillary spicate or capitate flowers. Calyx-tube campanulate, its teeth membranous, 
the 4 upper ones more or less united. Petals and stamens inserted at or near the summit of 
the tube; standard orbicular; wings oblong; keel curved, beaked. Stamens monadelphous; 
anthers alternately longer and shorter. Ovary nearly sessile; ovules 2-3; style filiform. Pod 
sessile, flattened, 1-2-jointed, reticulate, dehiscent at the summit. [Greck, column-flower, 
alluding to the column-like calyx-tube. ] 
About 25 species, natives of warm and temperate regions. Besides the following, another 
occurs in the southern States. 
1. Stylosanthes biflora (I,.) B.S.P. Pencil-flower. (Fig. 2168.) 
Trifolium biflorum I,. Sp. Pl. 773. 1753. 
Stylosanthes elatior Sw. Svensk. Acad. Handl. 1789: 296. 
pl. 2. f.2._ 1789. 
Stylosanthes biflora B.S.P. Prel. Cat. N. ¥.13. 1888. 
Wiry, branched from the base and often also above, 
stems ascending, erect or spreading, villous-pubescent 
or glabrate, 6’-24’long. Stipulessheathing the stem, 
linear-filiform above; leaves short-petioled; leaflets 3, 
oblong, linear-oblong or oblanceolate, acute or acut- 
ish and mucronate at the apex, narrowed or cuneate 
at the base, 6’’/-18’” long, 134’’-2’’ wide, strongly 
veined, the terminal one stalked; flowers few, mainly 
terminal, sessile or nearly so, yellow, ciliate-bracted, 
3/’-4’’ long; pod obovate or suborbicular, pubescent, 
about 2’” long, of 1 perfect and 1 abortive joint. 
In dry soil, southeastern New York to Florida, west to 
Indiana, Kansas, the Indian Territory and Louisiana. 
June-Sept. 
Eke ZORNIA Gel. Syst. 2: 1096. 1791. 
Herbs, with digitately 4-foliolate or 2-foliolate petioled leaves, the leaflets not stipellate, 
the stipules small or foliaceous, sagittate. Flowers yellow in our species, small, interrupt- 
edly spicate, large-bracted, sessile, rarely solitary, the spikes axillary and terminal, pe- 
duncled. Bracts 2 together, nearly enclosing the flower. Calyx 2-lipped, 5-lobed. Stand- 
ard nearly orbicular, clawed; wings oblique; keclincurved. Stamens monadelphous; anthers 
alternately longer and shorter. Ovary sessile; ovules several; style very slender. Loment 
flat, several-jointed. [In honor of Johann Zorn, a German apothecary. ] 
About 12 species, all natives of America, 2 of them naturalized in the warmer regions of the 
Old World. Besides the following, another occurs in the southwestern States. 
