82 BOTANY. 



Rocky Mountains to the Pacific, in Northern California and Washington 

 Territory, tins 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 C(i///< <u/tlii(s), which are divided between Eastern and Western North 

 America." — (Gray, Proc. Am. Acad, viii, pp. G23-G24.) 



RHAMNEJ2. 



Zizyphus* lycioides, Gray, var. oanescens, 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 i-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.) 



Karwinskiaj Humboldtiana, 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. 



Riiamnus crocea, Nutt. (T. & G. FL N. Am.). — " Low, branches 



* Zizyphds, Jobs. — Calyx 5-cleft, tube broadly oboonical, lobes triangular-ovate, acute, spreading, 

 carinate within. Petals B (rarely 0), hooded, deflezed. Disk flat, 5-angled, margin tree. Stamens 



f>, included or longer than the petals, filaments subulate. Ovary immersed iu the disk and at the base 

 continent with it, •->-, rarely 3-, most rarely 4-oelled; styles 2-3, conical, free or connate, divergent, 

 Btigmas small, papillose. Drupe fleshy, globose or oblong, pntamen woody or bony, 1-3-celled, 1-3- 

 Beeded. Seeds plano-convex, testa thin, fragile, at:tl smooth, albumen little or uone ; 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 creuate, 3-5-ncrved. Stipules 

 both spiiiisccnt or one caducous, hooked or straight, <\ ines short, axillary, few- flowered. Flowers small, 

 greenish. Fruit often edible. — Bkntiiam & HOOKBR. 



t K m;w inskia, Zucc. — Calyx 5-cloft, 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 

 sob-globose, immersed in the disk, fr. c, '.>-:> celled, septa parting in the middle, often attenuated (the 

 ovary) into a triangular style, with the apex 2-3-lobcd, stigmas obtuse, papillose; ovules 'J in Bath cell, 

 parallel, curved downward. Drape sub-globose or ovoid, apiculate with the persistent Style, surrounded 



ai base bv the calyx, pntamen l-8-oelled, each cell 1-seeded. Seeds erect, obovate, testa membranous, 



dark \.i imose, raphe elevated, albiiinen in a thin fleshy stratum adherent to the testa ; cotyledons oval, 



fleshy; radicle very short, -small trees and shrubs. Leaves sub-opposite, petielate, oblong, entire, 

 penninerved, pellaoidlj pnnotqlate. stipules membranous, deciduous. Flowers axillary, moemoee >»i 

 oyuioae. Cymes fhscicnlate -Bektitam d Huokkb. 



