FABACEAE 



60? 



6. Indigofera Lindheimeriana Scheele. Foliage densely strigillose with whitish hairs, 



consequently pale. Stems erect, 1-2 



m. 



tall, more or less branched : leaflets firm, 7-15, 



the blades oblong or oval varying to cuneate, 1-2 cm. long, mucronate, short-petioluled 

 racemes shorter tlian the leaf-like bracts : pedicels about 1 mm. long, finally recurved 

 calyx densely strigillose : lobes subulate-lanceolate, as long as the tube or longer: corolla 

 6-7 mm. long : pods linear, about 2 cm. long, curved, beaked, thickened at each suture. 

 In dry soil, Texas and adjacent Mexico. Spring to fall. 



Foliage strigillose. Stems erect, l-2m. tall, angular, 

 7-15, the blades oblong, oblanceolate or obovate, 1-3 cm. 



7. Indigofera Anil L. 

 sparingly branched : leaflets 



long, mucronate, acute at the base, glabrous or glabrate above : racemes shorter than the 

 leaf-like bracts : pedicels about 1 mm. long, finally recurved : calyx densely pubescent ; 

 lobes about as long as the tube: corolla 3.5-4.5 mm. long: pods stout, 12-15 mm. long, 

 curved, thickened at the sutures. 



In waste places. North Carolina to Florida and Louisiana, 

 to fall. 



Introduced from the tropics. Spring 



12. C -7 A CCA L. 



Perennial herbs or shrubby plants, with long tough roots and usually pubescent foliage. 

 Stems erect or prostrate, often branched at the base. Leaves alternate : blades unequally 

 pinnate: leaflets numerous, or rarely few, with entire blades. Flowers perfect, in axillary 

 lateral or terminal racemes. Calyx pedicelled : lobes nearly equal or the 2 upper united 

 and shorter than the lower. Corolla white, pink, purple or red : petals clawed : standard 

 suborbicular : wings oblique, lightly adhering to the incurved keel. Stamens diadelphous 

 or monadelphous. Anthers alike. Ovary sessile. Ovules numerous or rarely few. Pod 

 elongated, flat, 2-valved. Seeds variegated. [Tephrosia Pers.] The plants flower in 

 summer, or from spring to fall in the South. Cat-gut. Goat's Rue. 



Stem monopodial : flowers in terminal or axillary sessile racemes. 

 Calyx-lobes ovate to lanceolate : plants yiale- or gray-pubescent. 

 Calyx-lobes ovate, the upper shorter than the tube. 

 Calyx-lobes lanceolate, the ujiper longer than the tube. 



Leaflets with oblong or elliptic blades : stems and raceme pubescent with 



short hairs. 

 Leaflets with linear-lanceolate or linear-oblong blades : stems and raceme 

 woolly or villous. 

 Calyx-lobes very slender, often nearly setaceous : plants tawny-pubescent. 

 Stems symiiodial : flowers iu peduncled racemes which terminate the main axis 

 at one or more nodes. 

 Flowers relatively small : standard less than 10 mm. long. 

 Flowers relatively large : standard 10 mm. long or longer. 

 Petioles longer than the leaflets. 



Leaflets with linear to oblong or cuneate blades : pod.s about 4 mm. wide. 

 Leaflets with narrowly linear blades, slenderly acute. 

 Leaflets with oblong or cuneate blades, truncate or abruptly pointed. 

 Leaflets with obovate or suborbicular blades : pods 6 mm. wide or wider. 

 Petioles shorter than the leaflets. 



Racemes many-flowered, the middle nodes bearing 3-4 flowers. 

 Racemes few-flowered, the flowers single or in pairs at the nodes. 



Stem, at least the lower part, clothed with a tawny spreading pubes- 

 cence. 

 Leaflets with oblong or obovate blades, the terminal one nearly 



similar to the rest. 

 Leaflets with linear blades, the terminal one conspicuoxisly elon- 

 gated. 

 Stem clothed with an appressed or somewhat tomentose often lustrous 

 pubescence, or nearly glabrous. 

 Leaves manifestly petioled, not prostrate. 

 Leaflets mostly 11-17, relatively small. 

 Leaflets mostly 7-11, relatively large. 



Stems or branches prostrate : peduncles strigillose. 

 Stems or branches assurgent : peduncles hirsute. 

 Leaves sessile or nearly so, prostrate. 



Calyx-lobes longer than the tube : leaflets 6-13 mm. long : pods 



3 cm. long or more. 

 Calyx-lobes shorter than the tube: leaflets mostly 13-30 mm. 

 " long : pods 2 cm. long or less. 



1. Cracca latidens Small. Eoot exceedingly Ions: (^7-12 dm.) from elongated root- 

 stocks. Foliage finely and quite closely pubescent with pale hairs : stems often tufted, 

 2-5 dm. tall, finely ridged : leaves linear-oblong or narrowly oblong in outline, 5-9 cm. 

 long ; leaflets 19-37, the blades of the lateral ones mainly oblong, sometimes oblong- 

 cuneate, 9-17 cm. long, mucronate, those of each leaf quite uniform in size : raceme few- 

 flowered : calyx strigillose ; lobes ovate, rather abruptly pointed, the upper ones shorter 

 39 



