Y. PLANTiE WRIGHTIAN^. 67 



valvulis coriaceis. — Ramuli tenues rigidi, novelli vix minute puberuli, nunc visci- 

 duli. Folia ramorum sterilium vegetiora, petioli communi ssepe 1 - 1^-pollicari pu- 

 berulo, pinnis 4 - 6-jugis ; ramorum florentium glabra, petiolo communi raro 4 line- 

 as excedente, pinnis plerisque bijugis. Pinnae 4-6 lin. longse; foliola raro lineam 

 excedunt. Pedunculi solitarii vel cum foliis fasciculati, 6-9 lin. longum. Capitu- 

 lum parvum, florens cum staminibus 4 lin. diametro. Bractese alabastro breviores. 

 Flores 5-meri, rarius 4-meri. Calyx membranaceus, truncatus, breviter dentatus. 

 Petala calyce triplo longiora, alte connata. Legumen stipitatum, rectiusculum vel 

 falcatum, 2-5 poll, longum, 1-^-2 lin. latum, inter semina constrictum, suturis 

 leviter incrassatis. — This is the only American Medibracteate species known to me." 

 Benth. in litt — Prairies, near the source of the San Felipe, July; in flower and 

 fruit. Pass of the Limpia, Aug. ; in fruit (No. 162). Abundant in the collection 

 of 1851. Sand-hills 50 miles below El Paso ; Jornada del Muerto, and thence to 

 Chihuahua, common, Wislizenus (flowers exhaling the fragrance of orange-blos- 

 soms). Near Mier, Castanuela, and Buena Vista, Gregg. — Shrub 5 to 8 feet high. 

 Stipular spines on the flowering branches from 3 to 6 lines long. Most of the nu- 

 merous flowering specimens gathered by Mr. Wright during the past year have not 

 only the branchlets but the foliage glutinous, so that they adhere to the paper in 

 which they were dried. 



f A. Farnesiana, Willd. Common in Western Texas and Northern Mexico. 

 One of Gregg's specimens is referred by Mr. Benth am to the nearly allied A. Ca- 

 venia, and Lindheimer has a flowering specimen, with very small leaflets, which 

 might also be so referred.* 



ROSACEA. 



181. Prunus rivularis, Scheele in Linncea, 21. p. 594 ; verging to P. Ameri- 

 cana. Along the Leona River, June ; in fruit. — Lindheimer remarks, that it more 

 commonly grows on declivities than along the banks of streams. 



* Leucajna glauca is in Gregg's North-Mexican collection, from near Rinconada, where, as well as in 

 other localities, he also gathered the following remarkable Pithecolobiiim : — 



" PiTHECOLOBiUM BREVIFOLIUM (sp. Hov. Samanea stipuUs spinescentibus !) : ramulis inflorescentia fo- 

 liisque junioribus puberulis ; stipulis subulatis plerisque spinescentibus ; pinnis 3 - 5-jugis; foliolis 10-20- 

 jugis oblongo-linearibus subtus pallidis ; panicula foliosa ; floribiis cano-puberulis ; corolla calyce plus tri- 

 plo longiore ; ovario stipitato glabriusculo ; legumine recto glabro, valvulis baud coalitis." Benth in litt. 

 — Between Cerralvo and Monterey, more common in the low country, May, Wislizenus (No. 362, 355). 

 East of Rinconada and Papagallo ; also between Cerralvo and Maria, Gregg. — "This species in its 

 straight pod, not curled or twisted as in most Pithecolobia, and general character, is allied to P. fragrans 

 and P. Berterianum ; but it appears to be a shrub, not a tree ; the pinnae and leaflets are very much fewer ; 

 the pod is thinner and drier, although the valves are of a reddish hue inside, and show signs of a dried-up 

 thin pulp, as in all species of Pithecolobium ; and, above all, the stipules are generally persistent in the 

 form of straight spines from 2 to 4 [and even 6] lines long, which is not known to be the case in any oth- 

 er species of the section Samanea. The leaflets are from 2 to 3 lines long, very much like those of P. 

 fragrans. The inflorescence is but imperfectly developed in the specimens gathered, but appears to be 

 the same as that of P. fragrans." Benth. in lilt. 



Schrankia platycarpa, Gray., PI. Lindh. 2. p. 183, in Lindheimer's collection of 1849, has the broadly 

 linear and flat pods aculeate on the thickened margins, and along the middle of the valves, the rest of the 

 face naked. 



