312 



PAPIUONACEAE. 



[VOL. II. 



i. Aeschynomene Virginica (X.) B.S.P. 

 Sensitive Joint Vetch. (Fig. 2167.) 



Hedysarum Virginicum L. Sp. PI. 750. 1753. 

 A Esc hynomene hispida Willd. Sp, PI. 3: 1163. 1800. 

 AEschynomene 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- petiolcd; leaflets 25-55, oblong, linear-oblong 

 or oblanceolate, obtuse at the apex, narrowed or 

 rounded at the base, $"-<)" long; somewhat sensi- 

 tive; flowers few, reddish-yellow, about 5" long; 

 petals veined; pod linear, \'-i*' 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 S\v. Prodr. Fl. Ind. Occ. 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, i-2-jointed, reticulate, dehiscent at the summit. [Greek, 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 St;iU-->. 



i. Stylosanthes bifldra (L,.) B.S.P. Pencil-flower. (Fig. 2168.) 



Trifolinm biflornm L. Sp. 1M. 77;,. 1753. 

 Stylosanthes elatior Sw. Svensk. Acacl. Handl. 1789: 296. 



pi. 2. f. 2. 1789. 

 Slylosanthes biflora B.S.P. Prel. Cat. N. Y. 13. 1888. 



Wiry, branched from the base and often also above, 

 stems ascending, erect or spreading, villous-pubescent 

 or glabrate, 6 / -24 / long. Stipules sheathing the stem, 

 linear-filiform above; leaves short-petiolcd; leaflets 3, 

 oblong, linear-oblong or oblanceolate, acute or acut- 

 ish and mucronate at the apex, narrowed or cuncate 

 at the base, 6"- 18" long, \]^"-i" wide, strongly 

 veined, the terminal one stalked; flowers few, mainly 

 terminal, sessile or nearly so, yellow, ciliate-bracted, 

 $"-4" long; pod obovate or suborbicular, pubescent, 

 about 2" long, of I perfect and i abortive joint 



In dry soil, southeastern New York to Florida, west to 

 Indiana, Kansas, the Indian Territory and Louisiana. 

 June-Sept. 



33. ZORNIA Gmel. Syst. 2: 1096. 1791. 



Herbs, with digitately 4-foliolate or 2-foliolate petioled leaves, the leaflets not stipellate, 

 the stipules small or foliaccous, 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; keel incurved. 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. 



