5*8 FLORA. 



sessile; leaflets 9-17, approximate, linear-oblong or slightly oblanceolate, narrowed 

 at the base, 6-11 mm. long; spikes terminal, short-peduncled, cylindric, 2.5-8 cm. 

 long, n-13 mm. thick, dense; bracts lanceolate, acuminate, exceeding the densely 

 villous calyx; corolla rose-purple or rarely white; standard oblong; wings and 

 keel-petals oblong-obovate. Prairies, Wis. to Sask., Mo., Kans., and Mont. Aug. 



18. INDIGOFERA L. 



Herbs, or rarely shrubs, often canescent with hairs affixed by the middle, with 

 odd-pinnate leaves, small stipules, and pink or purple spicate or racemose flowers. 

 Calyx-teeth oblique, nearly equal, or the lower longer; standard ovate or orbicular, 

 se-sile 01 clawed ; wings oblong; keel erect, somewhat gibbous, or spurred; stamens 

 mainly monadelphous; ovary 1-00 -ovuled; style slender; pod linear, 4-angled (in 

 our species), septate between the seeds. [Name from the yield of indigo by some 

 species.] About 250 species, natives of warm and temperate regions. In addition 

 to the following, some 5 others occur in the southern U. S. 



1. Indigofera leptosepala Nutt. Wild or Western Indigo-plant. (I. F. 

 f. 21 16.) Perennial, decumbent, cinereous-pubescent, slender, 1.5-6 dm. long. 

 Leaves short-petioled; leaflets 5-9, oblanceolate or oblong-linear, 6-25 mm. long, 

 obtuse and often mucronulate at the apex, narrowed or cuneate at the base, short- 

 stalked ; spikes peduncled, loosely few-flowered ; flowers about 6 mm. long ; 

 calyx-teeth subulate, equal; pods linear, acute, sessile, 17-25 mm. long, 2 mm. thick, 

 reflexed at maturity. Kans. to Tex. and Mex., east to Fla. May-Nov. 



19. CRACCA L. [TEPHROSIA Pers.] 



Herbs, sometimes slightly shrubby, with odd-pinnate not punctate leaves, and 

 purple red or white flowers in racemes or short clusters. Stipules small; leaflets 

 entire; calyx -teeth usually nearly equal ; petals all clawed; standard orbicular or 

 broadly ovate; wings obliquely obovate or oblong; keel curved; stamens mona- 

 delphous or diadelphous ; ovules several or many; pod linear, flat, 2-valved, sev- 

 eral-seeded. [Latin, vetch.] About 120 species, mainly natives of warm and 

 tropical regions. Besides the following, 11 species occur in the southern U. S. 



Raceme terminal, dense, nearly sessile, many-flowered. 1. C. Virginiana. 



Peduncles lateral and terminal, elongated, few-flowered. 



Villous ; flowers in an interrupted spike or raceme. 2. C. spicata. 



Pubescent ; peduncles few-flowered near the summit. 3. C. hispidula. 



1. Cracca Virginiana L. Cat-gut. Goat's Rue. (I. F. f. 21 17.) Vil- 

 lous or silky with whitish hairs, 3-6 dm. high. Roots long, fibrous, tough; leaves 

 short-petioled; leaflets 7-25, oblong, linear-oblong or the terminal one oblanceolate, 

 narrowed or cuneate at the base, rounded, mucronate or emarginate at the apex, 

 18-25 mm. long ; flowers yellowish-purple, 13-19 mm. long ; pedicels 4-9 mm. 

 long; pod linear, densely pubescent, 2.5-5 cm ' l° n g- I* 1 dry sandy soil, Me. to 

 Minn., Fla., La. and Mex. June-July. 



Cracca Virginiana holosericea (Nutt.) Vail. Densely woolly-pubescent; leaflets 

 acutish. 111. to Wis., La. and Ark. 



2. Cracca spicata (Walt.) Kuntze. Loosely-flowered Goat's Rue. 

 (I. F. f. 21 18.) Villous-pubescent with long brown hairs, decumbent or straggling, 

 much branched, 3-6 dm. long. Leaves few and distant, short-petioled; leaflets 9- 

 15, short-stalked, oval, oblanceolate or narrowly obovate, obtuse and mucronate, 

 18-30 mm. long; peduncles slender, 1-2.5 dm. l° n g: inflorescence very loose, 5-12 

 cm. long; flowers purplish, 12-17 mm. long; pod linear, finely pubescent, about 5 

 cm. long. In dry soil, Del. to Fla., Ala. and Miss. June-Aug. 



3. Cracca hispidula (Michx.) Kuntze. Few-flowered Goat's Rue. (I. F. 

 f. 2 1 19.) More or less pubescent, procumbent or straggling, much branched, 

 slender, 3-6 dm. long. Leaves petioled; leaflets 5-19, short stalked, oval, oblong, 

 oblanceolate or obovate; peduncles slender, 5-iocm. long; flowers red-purple, few, 

 about 12 mm. long; pod linear, 2.5-4 cm. long, minutely pubescent. Dry sandy 

 soil, \'a. to Fla., west to Ala. May-Aug. 



20. BRADLEY A Adans. 

 High-climbing woody vines, with odd pinnate leaves, and showy blue or pur- 

 plish flowers in large terminal racemes. Calyx somewhat 2 -lipped, the 2 upper 



