122 ELEMENTS OF BOTANY. 



large, orbicular, reflexed, keel obtuse ; stamens diaclelphous ; 

 style bearded on one side; legume compressed, several- 

 seeded. 



R. PSEL'DACACiA L. Black Locust. A tree of medium size; 

 bark rough and nearly black ; twigs and leaves smooth ; leaflets 9- 

 15, ovate or oblong, obtuse and slightly mucronate at the apex; 

 stipules forming persistent spines ; racemes loose, pendulous, 3-5 in. 

 long; flowers white, fragrant; pod smooth, 4-8-seeded. April-May. 

 Introduced and (piite common ; wood very durable Avhen exposed to 

 the weather, and extensively used for posts. 



XII. INDIGOFERA. 



Herbs or shrubs ; leaves odd-pinnate ; stipules small ; 

 flowers in terminal and axillary racemes ; calyx 5-toothed, 

 oblique ; standard orbicular, erect, keel erect, with a spur on 

 each side ; stamens diadelphous ; legume slender, 1-many- 

 seeded. 



I. LEPTOSEPALA Nutt. WiLP Indigo. Perennial ; stem decum- 

 bent, rough hairy, 2-3 ft. long; leaves short-petioled ; leaflets 5- 

 9, short-stalked, linear-oblong; racemes peduncled, G-15-flowered; 

 flowers red ; pods not stipitate, linear, pendulous, septate between 

 the seeds which are truncate at each end. May-August. On open 

 ground. 



Besides the indigenous species described, I. tinctoria L. and I. 

 Anil L. were formerly cultivated for the manufactm-e of indigo, 

 and occasional plants are still found in waste places. 



XIII. GLOTTIDIUM. 



Annual ; leaves abruptly pinnate ; flowers in axillary 

 racemes ; calyx 5-toothed, oblique ; standard erect, reniform ; 

 stamens diadelphous ; style abruptly curved at the apex ; 

 legume long-stipitate, narrowly elliptical, compressed, the 

 outer and inner coats separating at maturity, 2-seeded. 



G. Floridanum (Willd.) DC. Coffee-weed. Stem yellowish- 

 green, smooth, erect, widely branched, 4-8 ft. high; leaflets numer- 

 ous, oblong-linear ; racemes long-peduncled, often compound ; flowers 

 yellow, near the summit of the peduncle ; legume 2 in. long. July- 

 September. Introduced ; common on dry soil. 



