216 Engelmann and Gray, 



46. A. leptocarpus, Torr. fy Gr. I. c. April, with the 

 preceding. 



47. Mimosa strigillosa, Torr. fy Gr. Fl. I. p. 399. Tet- 

 ramerous, octandrous. Hard clayey soil. April, June. — We 

 have this plant in cultivation. The foliage is nearly as sensi- 

 tive to the touch as M. pudica. 



48. Neptunia lutea, Benth. in Hook. Jour. Bot. IV. p. 

 356. Acacia lutea, Leav. ; Torr. &/• Gr. I. c. Moist prairies, 

 April — June. 



49. Acacia hirta, Nutt. in Torr. &/• Gr. 1. c. ; and 



50. § glabrior. Dry, open woods around Houston ; May, 

 June, and frequently flowering again in September. 



51. Acacia Farnesiana, Willd. ; Benth. Nearly the only 

 shrub on Galveston Island, where it attains the height of 6 or 

 7 feet, and forms considerable thickets. Its odorous flowers 

 are produced in April or May. Certainly indigenous to Texas, 

 and probably also to Florida. 



52. Lythrum alatum, var. y, Torr. fy Gr. Fl. I. p. 482. 

 " L. foliosum, n. sp." Engel. 3ISS. (who has noticed two 

 states, viz., 1. stamineum ; filaments as long as the darker 

 colored petals, the style not exceeding the calyx, and the 

 ovary frequently sterile ? 2. stylosum ; filaments as long as 

 the calyx only, the style as long as the apparently smaller and 

 paler petals, or longer.) But, if a distinct species, it will fall 

 under L. lanceolatum, Ell. 



53. CEnothera Drummondii, Hook. Downs of Galveston. 

 April, May ; also in the autumn. 



54. CE. linifoua, Nutt. Galveston Island. 



55. CE. speciosa, Nutt. Houston. April, May. 



56. CE. rhombipetala, Nutt. in Torr. &/■ Gr. Fl. I. p. 493. 

 This handsome species, so remarkable for its acute or acumi- 

 nate petals, has been cultivated in the botanic garden of Har- 

 vard University from seeds received from Mr. Lindheimer. 

 His specimens have broader leaves and petals than those from 

 Arkansas ; the upper leaves ovate-lanceolate, closely sessile and 

 somewhat cordate. The pods are cylindrical-prismatic, some- 



