82 BOTANY. 



Rocky Mountains to the Pacific, in Northern California and "Washington 

 Territory, this is only known at one station in the Alleghany Mountains, 

 and makes an addition to the list of those few genera (such as Boykinia 

 and Calyccmthus), which are divided between Eastern and Western North 

 America." — (Gray, Proc. Am. Acad, viii, pp. 623-624.) 



RHAMNE^. 



Zizyphus* lycioides, Gray, var. canescens, Gray. — A much branched 

 shrub, 4-5° high; younger branches covered with a light gray powdery 

 substance, which is readily scraped away, leaving the green epidermis 

 exposed beneath; leaves oval, obtuse, pubescent (especially beneath) ; peti- 

 oles 2-4" long; spiny branches £-1' long, thick, terminating abruptly in 

 a point. More or less leafy; flowers greenish. Valley of the Gila, Ari- 

 zona, at 3,080 feet altitude. (331.) 



KarwinskiaI Htjmboldtiana, Zucc. (Gray, PI. Wright. 1, p. 32). — 

 Shrub from 2-12° high, leaves oval and beautifully penninerved [Flow- 

 ers not seen.] Drupe ovoid, 4-5" long, pointed with the remains of the 

 style, cup or disk-like calyx terminating the pedicel after the drupe has 

 fallen. Plant appears to vary much in the shape of the leaves and in the 

 number of flowers in the axillary clusters. Arizona. 



PiHamnus crocea, Nutt. (T. & G. Fl. N. Am.). — " Low, branches 



* Zizyphus, Juss. — Calyx o-cleft, tube broadly obconical, lobes triangular-ovate, acute, spreading, 

 carinate within. Petals 5 (rarely 0), hooded, deflexed. Disk flat, 5-angled, margin free Stamens 

 5, included or longer than the petals, filaments subulate. Ovary immersed in the disk and at the base 

 confluent with it, 2-, rarely 3-, most rarely 4-celled; styles 2-3, conical, free or connate, divergent, 

 stigmas small, papillose. Drupe fleshy, globose or oblong, putamen woody or bony, 1-3-celled, 1-3- 

 seeded. Seeds plano-convex, testa thin, fragile, and smooth, albumen little or none; cotyledons thick ; 

 radicle short. — Shrubs or trees decumbent, or with many small branches, often with strong, hooked 

 spines. Leaves sub-distichous, alternate, petiolate, coriaceous, entire or crenate, 3-5-nerved. Stipules 

 both spinescent or one caducous, hooked or straight, cymes short, axillary, few-flowered. Flowers small, 

 greenish. Fruit often edible. — Bentham & Hooker. 



tKARWiNSKiA, Zucc. — Calyx 5-cleft, tube hemispherical or turbinate, acute lobes 3-angled, keeled 

 or with the keel produced within and above into a spur. Petals 5, short-clawed and hooded. Stamens 

 longer than the petals, filaments subulate. Disk lining the tube of the calyx, delicate limb free. Ovary 

 sub-globose, immersed in the disk, free, 2-3- celled, septa parting in the middle, often attenuated (tho 

 ovary) into a triangular style, with the apex 2-3-lobed, stigmas obtuse, papillose; ovules 2 in each cell, 

 parallel, curved downward. Drupe sub-globnse or ovoid, apiculate with the persistent style, surrounded 

 at base by the calyx, putamen 1-2-celled, each cell 1-seeded. Seeds erect, obovate, testa membranous, 

 dark-verrucose, raphe elevated, albumen in a thin fleshy stratum adherent to the testa ; cotyledons oval, 

 fleshy; radicle very short.— Small trees and shrubs. Leaves sub-opposite, petiolate, oblong, entire, 

 penninerved, pellucidly pnnctulate. Stipules membranous, deciduous. Flowers axillary, racemose or 

 cymose. Cymes fasciculate. — Bentham & Hooker. 



