100 EUAAINACEJi. KurwinsUu. 



entire, G to 10 lines lung, iiltenuuto into a slioit sleiulcr petiole, coriuceuua, jienni- 

 nerved ; stipules minute, deeiduoua : peduncles 1 - 3 Uowored, recurved in I'ruit : 

 fruit nearly dry, ovate, upiculate, IVoe iVuiu the disk, 6 to 8 lines long, lemon-yellow ; 

 peduncle half an inch long: nut very thick and hard, 1 - 3-celled, l-3seeded: 

 seed narnjwly oblong, without albumen: embryo green. — liot. Mex. liountl. 4G. 



Freijueut in gravelly nniiius near San Felipe, San Diego Co. {J'arrij, '2'hurber) ; Kock Ilouao 

 Suuunit, in same region {Dunn, Palmer) ; east of San Bernardino, Parry. 



2. KARWINSKIA, Zuccarini. 



Calyx 5-cleft ; the acute lobes carinate or spurred within near the apex. Petals 

 5, hooded, with short claws. Disk covering the calyx-tube. Ovary subglobose, not 

 adnate to the disk, 2 - 3-celled : ovules 2 in each cell, collateral : style 2 - 3-lobed 

 at the apex. Drupe surrounded at base by tlie calyx, apiculate : nut thin, 1-2- 

 celled ; the cells 1-seeded. Seed obovate, with thin albumen. — Unarmed shrubs ; 

 with somewhat opposite entire petioled leaves, penninerved and pellucid punctate ; 

 stipules membranaceous, deciduous ; flowers small, in axillary cymes. 



A genus of only 2 or 3 aiiccies, Mexican unil in the adjacent region on tlie north. 



* 1. K. Humboldtiana, Zucc. More or less pubescent, 2 to G le(!t high or 

 more, with straight brownish glandular branches : leaves oblong to ovate, ^ to 2 

 inches long, mostly rounded at base, obtuse or acute, shortly petioled, rather thick, 

 more or less ferruginous : peduncles short, several-ilowered, mostly 1 -fruited : ma- 

 ture fruit ovoid, fleshy, 3 to 4 lines long, 1 - 3-seeded. 



Throughout nortlieni Mexico, in W. Texas and New Mexico, Lower California, and probably 

 in the southeastern part of the State. 



3. RHAMNUS, Linn. Bucktuoun. 

 Flowers perfect or polygamo-diuicious. Calyx 4 -5-cleft, with erect or spreading 

 lobes, the campanulato tube lined with the disk and persistent. Petals 4 or 5, or 

 none, on the margin of the disk ; claws short. Stamens 4 or 5 : hlaments very 

 short. Ovary ovoid, free, 2-4-celled: style short, 3-4-cleft. Drupe baccate, 

 containing 2 to 4 bony or cartilaginous 1-seeded luitlets, mostly indeluscent. Seed 

 obovate. — Shrubs or small trees ; with alternate petioled pinnately veined leaves, 

 small deciduous stipules, and axillary cymose or racemose small greenish flowers. 



About 60 species, most frucjuent in the temperate regions of Europe and Asia. The N. Ameri- 

 can species are six, divided e(pially between tht; eastern and western coasts. 



§ 1. Seeds and nutlets deeply sulcate or concave on the back, the rhaphe in the hollow : 

 cotyledons foliaceous, with recurved margins : fioivers mostly dioecious, solitary 

 or fascicled in the axils. — Rhamnus proper. 



1. R. alnifolia, L'ller. A shrub, 2 to 4 feet high : leaves deciduous, ovate- 

 oblong, acute at each end or acuminate, 2 or 3 inches long, crenately serrate, the 

 slender petioles slightly pubendent: lobes of the calyx and stamens 5: i^itals want- 

 ing : fruit black, obovate, 3-lobed, three lines long, equalling the pedicels. — liook. 

 Fh i. 122, t. 42. 



Sierra Co., Lemmon. Washington Territory, and eastward to Canada and New England. 



2. R. crocea, Nutt. Much branched, 3 to 15 feet high, the young branches 

 pubescent : leaves evergreen, coriaceous, oblong or obovate to orbicular, obtuse or 

 retuse or acute, equally variable at base, 3 to 18 lines long, acutely and often glan- 

 dularly denticulate, glabrous, usually more or less yellowish brown or cojjper-colored 

 beneath ; petioles a lino long or less : flowers tetramerous, apetalous : fruit about 



