10 PLANTS WRIGHTIAN^. 



stout and strict, and loaded with. pods. All the lower leaves have fallen ; the 

 upper are half an inch or more in length. Silicles about three lines long, a little 

 shorter than the pedicels, oval, inflated, moderately compressed contrary to the 

 partition, cinerous, like the pedicels, &c., with, a close stellular pubescence, not 

 emarginate, tipped with a short but distinct style; the boat-shaped valves not 

 keeled, obscurely 1-nerved ; the septum linear-oblong. Seeds very numerous in 

 two series in each cell, oblong-oval, marginless, compressed contrary to the incum- 

 bent cotyledons. — A much stouter plant than any of the species of Hymenolobus 

 enumerated by Nuttall, but, except in the distinct style, the characters accord 

 with those of that genus, and with no other known to me. 



13. DiTHYREA WisLizENi, Eugelm. in Wisliz. Mem. N. Mex., p. 11. Iberis, n. 

 sp. I Torr. in Ann. Lye. Nat. Hist. New York, 2. p. 166. Valley of the Rio Grande, 

 sixty or seventy miles below El Paso ; Sept. (in flower and with ripe fruit). — A 

 striking plant, apparently common in the valley of the Rio Grande del Norte, and 

 well characterized by Dr. Engelmann. 



14. Vesicaeia Engelmannii, Gray, Gen. III. 1. p. 162, t. 70, 8p PI. Lindh. 2. 

 p. 144. Banks of the Rio Blanco, AVestern Texas ; May. 



15. V. ARGYR^A, Gray, PI. Lindh. 2. j). 146 ; var. foliis minus argenteis. Hills 

 of the Leona, and prairies of Live Oak Creek ; June. 



15". V. DENSiFLORA, Gray, PI. Lindh. 2. p. 145. Near Austin, Texas ; May. 



16. V. STENOPHYLLA, Gray, PI. Lindh. I. c. p. 149, in not. Gravelly bars of 

 the Rio Frio, Western Texas ; June. Calcareous hills of the Rio San Felipe, and 

 of the San Pedro ; July. Mountain valleys beyond the Limpia pass ; Aug. Also 

 gathered, the previous year, on the Texan side of the Rio Grande, near Presidio. 

 The collection embraces various forms of the species. In some of them the radical 

 leaves are rather broadly spatulate. 



17. Lepidium alyssoides, Gray, PL Fendl, p. 10. Valley of the Pecos ; Aug. 

 Mountain valleys farther towards the Rio Grande, and in the valley of that river 

 sixty or seventy miles below El Paso ; Sept. ; in flower and fruit. — Cotyledons in- 

 cumbent. — Dr. Gregg gathered the same species near Buena Vista, and in the 

 valley of Conchos, below St. Rosalia. 



18. L. soRDiDUM (sp. nov.): humile, bienne; caulibus diffusis a basi ramosis- 

 simis ramulisque tenuiter granuloso-viscosis ; foliis (imis ignotis) caulinis parvis 

 spathulatis inciso-pinnatifidis glabris ; racemis multis, fructiferis elongatis densis ; 

 floribus minimis fere apetalis tetrandris ; siliculis ovatis emarginatis apteris glabris 

 pedicellis erectiusculis confertis sequilongis ; cotyledonibus incumbentibus. — In 

 mountain valleys east of the Rio Grande del Norte ; Aug. — A depressed, insig- 

 nificant species ; the specimens loaded with fruiting racemes, on which the pedicels 

 are densely crowded. Silicles barely half as large as those of L. Virginicum. 



CAPPARIDACE^. 



19. PoLANisiA iTNiGLANDULosA, DC. Prodr. 1. p. 242. Cleome uniglandulosa, 

 Cav. Ic. 4. t. 306. Hills near El Paso, and on the San Pedro ; Aug. - Sept. — 

 The specimens have more or less stipitate pods, as has the similar plant in Coulter's 



