60 
* Flowers mostly diecious, appearing with the leaves, 4-merous, without a common peduncle: 
leaves deciduous : carpels 2. 
1. R. lanceolata Pursh. Tall shrub: branchlets puberulent or glabrate: leaves 
2.5 to 7.5 em. long, short-petioled, golden-pubescent, upper surface at Jength glabrate, 
lanceolate or ovate-lanceolate, serrulate with incurved gland-tipped teeth: flowers 
2 or 3 together in the lower axils. —A species of the Eastern States and extending into 
Texas, possibly not reaching our eastern limit. 
** Flowers mostly perfect, appearing after the leaves, in usually peduncled umbels. 
+ Leaves deciduous : flowers 5-merous : carpels 3. 
9. R. Caroliniana Walt. Tall shrub or small tree, with more or less puberulent 
twigs: leaves 5 to 12.5 cm. long, on petioles 12 to 18 mm. long, elliptical-oblong to 
broadly elliptical,acute or acuminate, remotely and obscurely low-serrate or crenulate: 
peduncle mostly 6 to 8 mm. long.—A common buckthorn of the Atlantic and Gulf 
States, extending into Texas as far west as the Pecos. 
3. R. Purshiana DC. Small tree with some pubescent twigs: leaves 5 to 15 cm. 
long, on short downy petioles, broadly elliptical, very obtuse to abruptly blunt- 
pointed, irregularly and closely serrulate or denticulate : peduncle mostly 8 to 30 mm. 
long.—A buckthorn of the Rocky Mountains found in the mountains of extreme 
western Texas. 
+ + Leaves mostly evergreen : flowers 4 or 5-merous : carpels 2 or 3. 
4. R. Californica Esch. Tall shrub, with more or less tomentose twigs: leaves 2.5 
to 10 em. long, on short petioles, mostly somewhat puberulent, elliptical-oblong or the 
smallest obovate, obtuse or acutish, the slightly revolute margin serrulate or denticu- 
late to nearly entire: peduncle mostly 4 to 16 mm. long. Var. TOMENTELLA Brewer 
& Watson is rather low’and spreading, with leaves densely short-tomentose below.— 
In the mountains of extreme western Texas. 
7. SAGERETIA Brongn. 
Shrubs with rigidly spreading spiny twigs, mostly obliquely oppo- 
site pinnately-veined glossy leaves, and very small flowers scattered 
along slender loosely branched axillary and terminal spikes. 
1. S. Wrightii Watson. Spreading shrub 6 to 15 dm. high: leaves 6 to 16 mm, 
long, elliptical to obovate, cuneate, entire or serrulate: inflorescence small and in- 
conspicuous, the few axillary spikes seldom exceeding the leaves.—On Capote Creek, 
west of the Chenate Mountains, in extreme western Texas (Havard). 
8. CEANOTHUS L. (NEw JERSEY TEA. RED-ROOT.) 
Shrubs or occasionally arborescent, spinose or unarmed, with alter- 
nate or opposite pinnately-veined or 3-nerved leaves, and small but 
showy white or blue flowers in often long-peduncled and dense axillary 
or termina! clusters.—Flowers in our species are mostly white. 
* Leaves alternate and 3-nerved : fruit not crested. 
+ Branches not rigidly divaricate or spiny : inflorescence thyrsoid : leaves usually large 
and serrate. 
1. C. Americanus L. Low, 3to9 dm. high, more or less villous-pubescent: leaves 
thin, ovate or oblong-ovate, 3.5 to 6.5 cm. long, on short petioles 4 to 12 mm. long: 
peduncles elongated —Throughout the Atlantic States and extending into Texas. 
2. C. ovatus Desf. Like the last, but nearly glabrous or somewhat pubescent : 
leaves narrowly oval or elliptic-lanceolate, 2.5 to 5 cm. long: peduncles usually 
short.—From the Colorado to the western border. 
