46 UNITED STATES AND MEXICAN BOUNDARY* 



Ceanothus dentatus^ Torr. d Gray^ Fl. I. c; LindL d Faxt. FL Gard. 1, p. 17, t. 4, 

 (Table X.) Sandy soils around Monterey, California ; Pannj. A low bush. Our specimens 

 correspond with Douglas's plant, except that in the latter the flowers are said to be white, 

 whereas they are blue in the former. They had, no doubt, ftided in the specimens from which 

 the original description was drawn. 



Ceanothus CRASsiroLiuSj (n. sp.): fruticosus, erectus ; ramulis teretibus albo-tomentosis ; foliis 

 ovatis obtusiusculis integerrimis crassis penninerviis subtus dense albo-tomentosis glabris minute 

 papillaris opacis; thyrsis subsessilibus brevibus subumbelliformibus densiiloris. (Taele XI.) 

 Mountains south of Los Angelos, February; Parry. A shrub 4 to 5 feet high, much branched. 

 Leaves 1 — ^1^ inch long, remarkably thick and coriaceous, re volute on the margin when dry, 

 pale dull, green above and appearing rough like shagreen under a lens ; petiole 2 — 3 lines long, 

 thick. Clusters of flowers terminal, and in the axils of the upper leaves. Calyx and corolla 

 white. Ovary marked with 3 minute protuberances. Fruit not known. 



Fbangula Cakoliniana, Gray^ Gen. III. 2, j?. 178, t. 167. Rhamnus Carolinianus, Walt. FL. 

 Gar. p. 101. Banks of streams, Los Muros, &c., Western Texas ; Bigelow. 



Frangula Californica, Gray^ I. c, & PL Wright. 2, p. 28. Mountain ravines near Camp 

 Bache, Western Texas; Bigelow. Sonora; Schotty Gapt. E. K. Smith. Monterey and San 

 Diego, California; Parry, Variable in the form and pubescence of the leaves. We ciuito agree 

 with Dr. Gray, that this species includes Rhamnus Californicus, Esch.^ R. oleifolius, Hook.^ R, 

 laurifolius, Nutt. R. leucodermis, Nutt., and R. tomentellus, Benth. 



Rhamnus croceus, Nutt. in Torr. d: Gray^ Fl. l,p. 261. Around Monterey and San Diego, 

 also on the mountains of southern California ; Parry. The leaves vary from ^ to 1^ inch in 

 length, and from obovate-oblong to broadly ovate. The under surface is always yellowish. 

 The fruit in Dr. Parry's specimens is all 2-seeded. 



ZizYPnus Parryi, (n. sp,) : glabra ; ramis spinosis ; foliis obovatis integerrimis sub-coriaceis 

 penninerviis; pedunculis unifloris, fructiferis recurvis; drupa sub-exsucca ovata apiculata 3-locu- 

 lare ; nuce crassissima ossea 3-loculari 3-sperma. Gravelly ravines near San Felipe, California, 

 June (in fruit) ; Parry^. It was afterwards found at the same place by Mr. Thurber. A shrub 

 4 — 6 I'eet high, much branched ; the branches smooth, flexuous, and armed with numerous 

 slender leafy spines. Leaves 8 — 12 lines long, obtuse or sometimes retuse, abruptly tapering at 

 the base into a short petiole ; stipules minute, subulate, deciduous. Only a solitary flower was 



from shor 



found. This was minute and pentamerous, i 



stamens. Peduncles solitary, or sometimes 2 



those of the fruit about half an inch long and recurved. Drupes 6 — 8 lines long, with a short 



abrupt point, lemon yellow, the pulp very thin. Nutshell extremely thick and hard. Seeds 



narrowly oblong. Albumen very thin. Embryo linear, oblong, green. This must be a very 



rare plant, as it lias been found but twice, and in both cases near the same spot. In its nearly 



dry 3-celled iruit and extremely thick shell it resembles Z. xylopyra of India. 



ZizYPHUS 0BTU3IF0LIA, Gray^ Gen. III. 2,^. IVO, t. 103 ; cfc PI. Lindh. 2, p. 168. Dry hills 

 and banks from El Paso to Eagle Pass, on the Rio Grande ; March — June ; abundant. 



ZizYPnus LYcioiDES, Gray^ L c. Near Elceario, on the Rio Grande, June (in fruit) ; Parry. 

 Valley of the Gila ; Thurber. Dr. Gregg found it between Matamoras and Mapini. The fruit 

 is black and somewhat astringent, but edible. 



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