288 PROCEEDINGS OF THE AMERICAN ACADEMY. 



detail with the original and with Dr. Watson's description ; they show, 

 moreover, that the slender upright stems originate from a distinctly 

 perennial base. 



Cassia (§ Chamaechristae) leptadenia, n. sp. Annual: stem 

 simple or branched, erect, 1 to 4 dm. high, pubescent with an upwardly 

 subappressed puberulence commonly intermixed with long horizontally 

 spreading hairs : leaves short-petiolate, 1 to 5 cm. long, 1 to nearly 2 

 cm. broad; leaflets sessile, usually 24 to 36 (sometimes fewer), linear- 

 oblong, 5 to 10 mm. long, 1 to 2.5 mm. broad, mucronate, rather con- 

 spicuously ciliate, glabrous on both surfaces or with a few scattered hairs 

 beneath, somewhat oblique at the base ; rhachis pubescent with long 

 spreading hairs, slightly canaliculate above, bearing just below the first 

 pair of leaflets a stipitate tack-shaped gland ; petioles 2 to 5 mm. long ; 

 stipules oblique-lanceolate, 3 to 6 mm. long, ciliate : flowers 1 to 3, on 

 short axillary or supra-axillary branches, small, about 0.5 cm. long, and 

 less than 1 cm. in diameter; pedicels 3 to 5 mm. long, 1-2-bracteate 

 above the middle, somewhat elongated at maturity ; sepals lanceolate, 

 acute, slightly pubescent: petals unequal, pinkish or yellowish-pink; 

 stamens 5 to 8, of different lengths : ovary appressed-pubescent : legume 

 2 to 4.5 cm. long, 3 to 4 mm. broad, on upwardly arched pedicels, subap- 

 pressed-pubescent : seeds flat, oblique, about 2.5 mm. long. — C. nictitans, 

 Gray, PI. Wright. 1 : 50 (1852), not L.; Torr. Bot. Mex. Bound. 59, not L.; 

 Rothrock in Wheeler's Report, 106, not L. — United States. Texas : 

 gravelly plains near Comanche Springs, Dr. J. M. Bigelow (hb. Gr.) ; 

 48 km. east of El Paso, May to October, 1840, Chas. Wright, no. 15 4 

 ( hb. Gr.). New Mexico: without locality and number, Chas. Wright, 

 coll. of 1851 (hb. Gr.); Organ Mts., 1 September, 1897, E. O. Wooton, 

 no. 435 (hb. Gr.), distributed as " Cassia calycoides, DC." ; Florida Mts., 

 27 August 1895, A. I. Mulford, no. 1038™ (hb. Gr.). Arizona: without 

 locality, coll. of 1884, C. G. Pringle, no. 92 (hb. Gr.) ; Blue River, 

 Clifton, 1 September, 1903, Dr. A. Davidson, no. 1340 (hb. Gr.) ; 

 Sonoita Valley, 1874, Dr. J. T. Rothrock, no. 629 (hb. Gr.). Mexico. 

 State of Sonora : Ojo de Gavilan, August, 1851, Geo. TImrber, no. 1060 

 (hb. Gr.). State of Durango : vicinity of the city of Durango, April to 

 November, 1896, Dr. El. Palmer, no. 654 (hb. Gr.). State of Oaxaca : 

 Valley of Etla, September, 1895, C. Alvarez, no. 754 (hb. Gr.). 



Var. mensalis, n. var. Stem 3 to 5 dm. high : leaves 2.5 to 9 cm. 

 long; leaflets 12 to 50 (6 to 25 pairs), 1 to 1.5 cm. long, 2 to 3 mm. 

 broad; pedicels 2 to 8 mm. long: other characters of the species.^ 

 Mexico. State of Chihuahua : Hacienda Sau Miguel, near Batopilas, 



