550 CELASTRACEAE 



many as the sepals and petals. Gynoecium of a compound pistil; stigma sessile, 

 slightly notched; ovan^ 1-celled, with 2 basal anatropous ovules. Fruit foUicu- 

 lar, 1- or 2-seeded; seeds with a minute aril or caruncle at the base. [Glosso- 

 petalon A. Gray.] 



Stamens 5-7. 1. F. meionandra. 



Stamens 10. 2. F. spinescens. 



1. F. meionandra (Koehne) Heller. A low intricatelj^ branched spinescent 

 shrub; leaves grayish green, blades up to 15 mm. long, cuneate oblong or ob- 

 lanceolate; sepals ovate; petals 5-6 mm. long, 2 mm. wide, spatulate. Glosso- 

 petalon meionandrum Koehne. Hills: w Colo. Submont. My. 



2. F. spinescens (A. Gray) Greene. An intricately branched, spinescent 

 shrub 3-12 dm. high; leaves glaucous, glabrous, oblanceolate or linear-oblance- 

 olate, 5-10 mm. long, acute; sepals oblong-ovate, 2 mm. long; petals narrowly 

 hnear, 4-5 mm. long; capsule ovoid, somewhat flattened, strongly striate. G. 

 spinescens A. Gray. Mountain ravines and cliffs: Ore. — Calif. — Tex. — Colo.; 

 Mex. Son. F-My. 



Family 77. ANACHARDIACEAE. Sumach Family. 



Polygamous, monoecious, or dioecious, or rarely hermaphrodite shrubs or 

 trees, with alternate, simple or pinnate leaves, without stipules. Inflore.s- 

 cence paniculate, or spicate, or racemose. Flowers regular. Sepals 3-5, 

 distinct. Petals 3-5, usually inserted on a hypogynous disk, imbricate or 

 rarely valvate. Stamens 3-5, rarely more, alternate with the petals. Gynoe- 

 cium of 1, or 4 or 5 united or nearly distinct carpsls; styles united, sometimes 

 distinct; stigmas entire. Fruit a drupe or a berry; seeds solitary. 



Drupe with pubescent exocarp; stone smooth. 1. Rhus. 



Drupe with glabrous, smooth exocarp; stone ribbed. 2. Toxicodendron. 



1. RHUS (Tourn.) L. Sumach, Skunk-bush. 



Shrubs or trees, not poisonous. Leaves alternate, odd-pinnate, rarely imi- 

 foholate; leaflets more or less toothed. Plowers in terminal panicles, polj-gamous 

 or dioecious. Sepals commonly 5. Petals as many, imbricate. Ovary 1-celled; 

 ovules pendulous. Drupe red, covered with acid-secreting hairs. Stone smooth. 

 Stamens 5, inserted under the edge or between the lobes of the flattened disk. 

 Flowers greenish white or yellowish. 



Leaflets 11-21; inflorescence terminating leafy shoots. 



Leaflets light green or yellowish green, rather dull, subsessile. 1. R. cismontana. 

 Leaflets dark green above, shining, strictly sessile. 2. R. occidentalis. 



Leaflets 1—3, rarely 5; inflorescence axillary. 



Leaves densely villous. 3. R. Osterhoutii. 



Leaves puberulent or glabrous. 



Leaves 3-foUolate, rarely 5-foliolate. 



Branchlets and leaves puberulent, at least when young. 4. R. trilobata. 

 Branchlets and leaves glabrous, except a few scattered cilia on the petioles 

 and veins. 5. R. oxyacanthoides. 



Leaves l-foUolate, or rarely some of them 3-foliolate with small lateral leaflets 

 and a broad terminal orie. 6. R. utahensis. 



1. R. cismontana Greene. Shrub 1-2 m. high; branches glabrous, often 

 reddish, somewhat glaucous; leaves 1.5-2 dm. long; leaflets 11-15, usually pallid 

 green, often lighter along the veins, glaucescent beneath, 5-10 cm. long, lance- 

 olate, abruptly acuminate, sharply serrate, thin; panicle about 1 dm. long; branches 

 usually spreading, finely pubescent; calyx-lobes 1 mm. long; petals greenish 

 yellow, 2-2.5 mm. long. R. sambucina, R. tessellata, R. albida, and R. asplenifolia 

 Greene. Along streams: S.D. — Mo. — N.M. — Ariz.^ — Wyo. Plain — Submont. 

 My-Jl. 



2. R. occidentalis (Torr.) Blankinship. Shrub 1-3 m. high; branches 

 glabrous and glaucous; leaves ascending, often 3 dm. long; leaflets 11-21, oblong- 

 lanceolate, 6-8 cm. long, sharply serrate up to the long acumination, very glau- 



