136 UNITED STATES AND MEXICAN BOUNDAKY. 



usculis; interdum serrulato-repandis supra scabriuscule pubescentis siibtus veliitino-tomentosis ; 

 pediinculis corymbosif^ rufo-tomentosis ; calyce cylindraceo-ovato^ dentibus subulato-acuminatis; 

 corolla infimdibuliformi calyce diiplo-longiore glabriuscnla. i^ear Monterey, Mexico ; Dr, 

 Edwardsy Gregg. New Leon ; Thurher. May. Cretaceous bills around Ringgold Barracks 



on tbe Rio Grande ; Scliott. (No. 304^ Berlandier.) A slirub or small tree, sometimes attaining 

 a lieigbt of 15 or 20 feet. Leaves 3-4 incbes long, and 2-3 incbes wide. Flowers in terminal 

 corymbs. Corolla an incb and a balf long, wbite, witb a yellow centre. Stamens 5, shorter 

 than tbe corolla ; filaments slender.; anthers oblong. Style twice bifid ; the lobes obtuse, 

 flattish. Fruit enclosed in the enlarged calyx, oblong, with a thin pulp. Endocarp thick and 

 bony. Albumen none; cotyledons foliaceous, much plicate and veiny. The Mexicans call this 

 plant Nacahuita. Dr. Gregg says that the fruit is eaten by cattle and hogs, and that a decoc- 

 tion of the leaves is used for pains in the limbs. It is closely allied to C. Sebestena, Linn. (0. 

 speciosa, Willd.y which grows on Key West); but differs in the soft velvety undersurface of the 

 leaves, the shorter calyx with more pointed teeth, etc. 



EnKETiA ELLiPTicA, DG. Prodr. 9^ p. 503. Texas; Wright. Near Corpus Christi ; 3IaJor 

 Eaton. Near Monterey, Mexico to Camargo ; Gregg. Santa Rosa, Chihuahua ; Bigelow. 



Between Ringgold Barracks and the mouth of the Rio Grande; Scliott. September. (Nos. 



A, 



233, 236 and 900, Berlandier.) A tree 20-30 feet high, and often nearly a foot in diameter, 

 with gnarled branches. Flowers sometimes tetramerous. Fruit the size of a large pea, yellow, 



with a thia edible pulp. 



Ptilocalyx Greggii, Torr. & Gray^ Bot. Pojje's Eep. p. 14, t. 8. Rocky places on the Rio 

 Grande, from El Paso to the Presidio. (Nos. 492 and 1583, Wright.) A shrub 1-3 feet high, 

 with small oval leaves ; remarkable for the spherical clusters of flouers and plumose calyx- 



segments. 



Stegnocarpus canescens, Tott, & Grayy I. c.^p 13, f. 7. Coldenia? (Stegnocarpus) canescens, 

 DG. Prodr. 9, p. 559. Dry hills near El Paso, etc., March— May. (Nos. 836, 959, 2256, 



2389, Berlandier.) 



TiQUiLiA EREViFOLiA (Nutt, hevh.)'. aunua; foliis ovatis, 3-4 veinis; staminibus inclusis, Torr. 



in Bot. U. S. Expl. Exped. ined. ^.12. Desert west of the Colorado, California, March ; Schott. 

 This plant was found by Major Emory in 1846, in the same desert ; but bis specimens were 

 collected in the winter, and were too imperfect for determination. T, dichotoma, Pers.y (Col- 

 denia? dichotoma DG.y) differs in being suffrutescent and in having lanceolate leaves. Late in 

 the season tbe leaves become rigid and hispid. The remarkable character of the lobed coty- 



w 



ledons in this genus -was pointed out to my friend Dr. Gray many years ago. It is fully 

 described in tbe Botany of the United States Exploring Expedition. Mr. Bentham has noticed 

 it in HooTc. Jour. Bot. <& Keiv MiscelL 3,^, 296. 



Var. PLiCATA : foliis oblongis utrinq^ue 5-7-veniis plicato-rugosis. With the preceding. 

 Leaves remarkably plicate between the veins. Late in the season the stem of this becomes hard 

 and ligneous, so that, without examinin 



o 



m 



Torr. & 



Gravelly hills near El Paso, 



New Mexico ; March — May. (Nos. 485 and 1557^ Wright.) 



Heliotropiual Curassavicum, Linn.; DG. Prodr. 9^ p. 538. Sandy places, especially on the 



