55 8 FLORA. 



2. Hedysarum Mackenzii Richards. Mackenzie's Hedysarum. (I. F. f. 

 2166.) Similar to the preceding, but usually minutely pubescent; stem 3-7.5 dm. 

 high. Leaflets 11- 19; flowers slightly larger, violet-purple, deflexed ; calyx-teeth 

 longer than the tube, or equalling it; pod minutely pubescent, 3-8-jointed. Hud- 

 son Bay (according to Macoun); N. W. Terr, to Alaska, south to Colo. Summer. 



31. AESCHYNOMENE L. 



Herbs, or in tropical regions shrubs, mainly with odd-pinnate leaves, and yel- 

 low flowers in axillary clusters. Calyx-teeth nearly equal, more or less united into 

 2 lips. Standard orbicular, short-clawed ; wings oblong or obliquely obovate, 

 about as long as the standard; keel curved. Stamens diadelphous (5 and 5); 

 anthers all alike. Ovary stipitate ; ovules 2-00 . Pod stalked, flat, jointed. 

 [Greek, to be ashamed, referring to the sensitive leaves.] About 55 species, in 

 warm and tropical regions. Besides the following, 1 occurs in the Southern States. 



1. Aeschynomene Virgmica (L.) B. S. P. Sensitive Joint Vetch. (I. F. 

 f. 2167.) Annual, rough-pubescent or glabrate, 6-15 dm. high. Stipules mem- 

 branous, ovate, acuminate, 4-9 mm. long, deciduous; leaves short-petioled ; leaf- 

 lets 25-55, oblong, linear-oblong or oblanceolate, obtuse, 6-18 mm. long, some- 

 what sensitive; flowers few, reddish-yellow, about 11 mm. long; petals veined; 

 pod linear, 2.5-6 cm. long, sparingly tuberculate or glabrous, of 5-10 nearly square 

 easily separable joints. River banks, Penn. and N. J. to Fla., west to La. 

 Aug. -Sept. [A. hispida Willd.] 



32. STYLOSANTHES Sw. 



Perennial herbs, mainly with villous or viscid pubescence, 3-foliolate leaves, 

 and yellow terminal or axillary spicate or capitate flowers. Calyx-tube campanu- 

 late, its teeth membranous, the 4 upper ones more or less united. Petals and sta- 

 mens 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 or 3 ; style filiform. Pod sessile, flattened, 

 1-2-jointed, reticulate, dehiscent at the summit. [Greek, column-flower, alluding 

 to the column-like calyx-tube.] About 25 species, of warm and temperate regions. 

 Besides the following, another occurs in the Southern States. 



Leaves oblong-linear to oblanceolate ; floral bracts entire. 1. S. biflora. 



Leaves elliptic to obovate ; floral bracts deeply cleft. 2. S. riparia. 



1. Stylosanthes biflora (L.) B. S. P. Pencil-flower. (I. F. f. 2168.) 

 Stems wiry, villous-pubescent or glabrate, 1.5-6 dm. long. Stipules sheathing, 

 linear-filiform above; leaves short-petioled; leaflets acute or acutish and mucronate, 

 12-36 mm. long, strongly veined, the terminal one stalked; flowers few, mainly 

 terminal, sessile or nearly so, ciliate-bracted, 6-9 mm. long; pod obovate or sulx)r- 

 bicular, pubescent, about 4 mm. long, of 1 perfect and 1 abortive joint. In dry 

 soil, N. Y. to Fla., Ind., Kans. and La. June-Sept. [S. elatior Sw.] 



2. Stylosanthes riparia Kearney. Decumbent Tencil-flower. (I. F. f. 

 2168a.) Stems 1-3 cm. long, usually with a tomentose line on the elongated in- 

 terne xles. Stipules subulate above; petioles pubescent; leaflets elliptic to obovate- 

 cuneate, the terminal one 10-18 mm. long, the lateral ones somewhat smaller; spikes 

 terminal, about 6-flowered, with only 1 or 2 perfect flowers; calyx-tube conspicu- 

 ously veined; vexillum proportionately longer than in S. hijlora; upper segment of 

 the pod nearly twice as broad as in S. biflora. In dry woods, Va. and W. Va. to 

 Ala. and Tenn. May-Aug. 



33. ZORNIA Gmel. 

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

 stipellate, the stipules sagittate. Flowers yellow in our species, small, interrupt- 

 edly spicate, large-bracted, sessile, rarely solitary, the spikes peduncled. Bracts 

 2 together, nearly enclosing the flower. Calyx 2-lipped. 5-lobed. Standard 

 nearly orbicular, clawed ; wings oblique; keel incurved. Stamens monadelphous; 

 anthers alternately longer and shorter. Ovary sessile; ovules several; style very 

 slender. Ix>ment flat, several jointed. [In honor of Johann Zorn, a German 

 apothecary. 1 ] About 12 species, all natives of America. Besides the following, 

 another occurs in the Southwestern States. 



