FABACEAE 609 



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 than 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. 



7. Indigofera Anil L. Foliage strigillose. Stems erect, l-2m. tall, angular, 

 sparingly branched : leaflets 7-15, the blades oblong, oblanceolate or obovate, 1-3 cm. 

 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. Introduced from the tropics. Spring 

 to fall. 



12. CRACCA 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 pale- or gray-pubescent. 



Calyx-lobes ovate, the upper shorter than the tube. 1. C. latidens. 



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



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



short hairs. 2. C. Virginiana, 



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



woolly or villous. 3. C. holosericea. 



Calyx-lobes very slender, often nearly setaceous : plants tawny-pubescent. 4. C. Rugelii. 



Stems sympodial : flowers in peduncled racemes which terminate the main axis 



at one or more nodes. 



Flowers relatively small : standard less than 10 mm. long. 5. (7. purpurea. 



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

 Petioles longer than the leaflets. 



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



Leaflets with narrowly linear blades, slenderly acute. 6. C. gradllima. 



Leaflets with oblong or cuneate blades, truncate or abruptly pointed. 7. C. ambigua. 

 Leaflets with obovate or suborbicular blades : pods 6 mm. wide or wider. 8. C. Lindheimeri. 

 Petioles shorter than the leaflets. 



Racemes many-flowered, the middle nodes bearing 3-4 flowers. 9. C. onobrychoides. 



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. 10. C. spicata. 



Leaflets with linear blades, the terminal one conspicuously elon- 

 gated. 11. C.flexuosa. 

 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. 12. C. hispidula. 



Leaflets mostly 7-11, relatively large. 



Stems or branches prostrate : peduncles strigillose. 13. C. Floridana. 



Stems or branches assurgent : peduncles hirsute. 14. C. Smattii. 



Leaves sessile or nearly so, prostrate. 



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



" 3 cm. long or more. 15. C. chrysophytta. 



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



long : pods 2 cm. long or less. 16. C. Chapmanii. 



1. Cracca latidens Small. Root exceedingly long (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 

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