FABACEAE 633 



1. Aeschynomene viscidula Michx. Perennial, the plant more or less densely 

 sticky-pubescent. Stems branclied at the base, the Ijranches spreading or prostrate, 1-12 

 dm. long, curved : leaves 1-2 cm. long : leaflets 5-9, the blades firm, obovate, 3-12 mm. 

 long, oblique, reticulated, mucronate, short-stalked : peduncles few-flou-ered : pedicels 

 spreading : calyx campanulate ; tube prominently veined : corolla yellowish or purplish ; 

 standard M-ith a broadly orbicular retuse blade : pods 1-2 cm. long, 2-3-jointed, the joints 

 half-orbicular. 



In sandy pine lands, Georgia to Florida and Mississippi. Spring to fall. 



2. Aeschynomene Virglnica (L. ) B.S.P. Annual, the plant glabrate or hispid. 

 Stems erect, 2-15 dm. tall, branching : leaves 2-10 cm. long, the rachis more or less gland- 

 ular, especially near the base : leaflets numerous, the blades linear or oblong-linear, 3-12 

 mm. long, mucronulate, not reticulated : peduncles several-flowered : pedicels 4-0 mm. 

 long : calyx campanulate ; tube not prominently veined : corolla nearly 1 cm. long, reddish 

 yellow ; standard with an orbicular-ovate blade notched at the apex : pods linear, 3-8 cm. 

 long, the joints nearly square, easily separable. l_A. hispida Wilhl.] 



In sandy soil, on river banks, New Jersey and Pennsylvania to Florida and Louisiana. Summer 

 and fall. 



36. ZORNIA Gmel. 



Annual or perennial herbs, with erect or prostrate stems. Leaves alternate : blades 

 2-4-foliolate, commonly petioled : leaflets often glandular-punctate. Flowers perfect, in 

 axillary or terminal conspicuously bracted spikes. Calyx membranous, the 2 upper lobes 

 forming a lip about as large as the lower lobe, the 2 lateral lobes smaller. Corolla of 

 various colors, ours yellow : standard with a broad clawed blade : Avings oblique, often 

 shorter than the somewhat lunate keel. Stamens monadelphous. Anthers alternately 

 larger, attached at the base, and shorter, versatile. Ovary sessile : style filiform. Ovules 

 numerous. Loment flattened, several-jointed, smooth or bristly, the joints indehiscent. 



1. Zornia bracteata (Walt.) Gmel. Perennial by a long root, more or less densely 

 strigilose. Stems branched at the base, the branches spreading or prostrate, 1-7 dm. long, 

 simple or branching : leaves distant ; leaflets often 4, the blades oval to elliptic or nearly 

 linear, often somewhat broadest above the middle mucronate ; petioles shorter than the 

 leaflets or longer : peduncles longer than the subtending leaves, few-flowered : bracts elliptic 

 or oval, 7-11 long, acute, reticulated, with an auricle at the base : calyx-lobes ciliate, the 

 lateral ones much shorter than the others : corolla yellow ; standard with a hooded blade 

 and a slender claw : pods 3-4-jointed, 1-2 cm. long ; joints echinate. [Z. tetraphylla 

 Michx.] 



In sandy soil, Virginia to Florida, Texas and Mexico. Spring and summer. 



37. STYLOSANTHES Sw. 



Perennial, rigid herbs, with bristly or sticky-pubescent foliage. Leaves alternate : 

 blades pinnately 3-foliolate : leaflets prominently nerved. Flowers of two kinds, the one 

 complete but sterile, the other destitute of perianth and stamens but fertile, in axillary or 

 terminal spikes or heads. Calyx sessile : tube slender : lobes 5, membranous, disposed in 

 2 lips by the union of the 4 upjier lobes. Corolla yellow or orange : standard with a spread- 

 ing blade : wings oblong : keel incurved, entire. Stamens monadelphous. Anthers alter- 

 nately longer and attached at the base, and shorter and versatile. Ovary sessile or nearly 

 80 : style filiform. Ovules 2-3. Loment 1-2-jointed, the lower joint empty, the upper 

 opening at the apex. Pencil-flower. 



Flowers accompanied by an appendage within the bract. 1. .S". hamata. 



Flowers not accompanied by an appendage within the bract. 



Blade of the standard longer than broad ; spurs curved : terminal joint of the pod 



with an almost axile beak. 2. S. biflora. 



Blade of the standard broader than long ; spurs straight : terminal joint of the pod 



triangular, with the beak lateral. 3. S. riparia. 



1. Stylosanthes hamkta (L. ) Taubert. Root elongated. vStems usually several, 

 ascending or i)rocnmbent, 2-7 dm. long, often branched, lightly striate, with pubescent 

 lines below the stipules : leaflets 3, the blades oljlong to oblong-lanceolate, 7-17 mm. long, 

 acute at both ends and often short-mucronate, prominently nerved, glabrous except occa- 

 sional marginal hairs : spikes terminal, about 15 mm. long, few-flowered : calyx finely 

 pubescent : corolla yellow : pods 2-jointed, the lower joint usually abortive, the terminal 

 one with 1-ribbed sides and a hooked pubescent beak. 



In sand, peninsular Florida and tropical America. Throughout the year. 



