SITMACH FAMILY 551 



cous beneath: panicles 1-2 dm. long, branches usually strongly ascending, rather 

 densely pilose; calyx-lobes 1.5 mm. long; petals yellowish, 3 mm. long: fruits 

 4 mm wide. R. glabra occidentalis Torr. R. arguia Greene. R. nUens Greene. 

 Along streams: Ore. — B.C. — Mont. — Utah. Son. My-Jl. 



3. R. Ost«rhoutii Rydb. Shrub about 1 m. high; leaves trifoUolate; 

 leaflets sessile, 1-2. .5 cm. long, cuneate, 3-5-lobed and some of the iobes with 

 roxmded teeth, dark green above, pale beneath. SchinaUzia pubescent Osterh. 

 Hills: Colo. Submotti. Je. 



4. R. trilobata Xutt. Shrub 1-2 m. high, blooming before the leaves; 

 leaves trifoliolate, with unpleasant odor; leaflets 1-3 cm. long, dark green above, 

 paler and minutely pubescent beneath, the lateral ones elliptic or ctmeate- 

 obovate, the termmal one cuneate-sijattilate, usually more or less 3-lobed and 

 crenate; petals obovate, 2 mm. long; fruit globose, 6-6 mm. thick, more or less 

 densely short-pubescent. Schmalizia triiobaia, S. Bakeri, S. cognaia, S. glomerata, 

 S. subpinnaia, and 5. glabraia Greene. Hills and plains: Sask. — Mo. — Tex. — 

 Calif. — Wash. Plain — Submont. Ap-Je. 



5. R. ozyacanthoides (Greene) Rydb. Low shrub, about 1 m. high; leaves 

 3-foholate: leaflets obovate-cuneate, or the terminal one rhombic-obovate, 

 rather thin, rounded-crenate, the terminal one 2-4 cm. long, and often 3-lobed, 

 the lateral ones 1.5-3 cm. long; fruit bright red, puberulent. Schmaltzia oxy- 

 acanihoides Greene. Hills and canons: w Colo. — Utah — (? Mont.) Submont. 

 Ap-My. 



6. R. utahensis Goodding. A shrub 1-1.5 m. high, diffusely branched; 

 leaves simple, the blades usually suborbicular or reniform, truncate at the base, 

 crenate. or rarely 3-lobed, 1..5-3 cm. long, finely pubescent beneath: inflorescence 

 few-flowered; fruit rather large, 5— S mm. thick, short-pubescent. R. canadensi.s 

 simpUcifoJUi Greene. SchynoUzia simplicifoiia and 5. affinis Greene. Desert 

 regions: Utah — Ariz. — L. Calif. Son. Ap. 



2. TOXICODENDRON -J-oum.) MiU. Poisox I^-T, Poisox Oak, 



Poisox SrMACH. 



Shrubs, trees, or vines, with a resinous sap, poisonous to touch. Leaves 

 alternate, pinnately 3-several-foliolate, with coarsely toothed or entire leaflets. 

 Flowers jwlygamous, panictilate. Sepals 4-6. persistent. Petals 4r-6, imbricate, 

 yellowish or greenish. Disk annular. Stamens 4—6 or 10. Ovary 1-celled; ovules 

 pendulous. Drupe whitish, smooth, shining, glabrous. Stone striately ribbed. 



Leaflets tMck, the Terminal one deddedly Itrnger than txt»d, its petioliile usually 1—2 cm. 



loag: petals 3 rnm long. 1. T. Rydbergii. 



Leckflets thin, the temiinal one neatiy as Ixtiad as long, its p«iolule 3—4 cm. laag; p^^ls 



2.5 rcLni. long. 2. T. longipcs. 



1. T. Rydbergii Small) Greene. A single-stemmed shrub, usually less than 

 1 m. high: leaves piimately 3-foUolate; leaflets 3-10 cm. long, rhombic-ovate, 

 thick, bright green, strongly veined beneath, glabrous, usually coarsely and 

 broadly toothed: flowers in dense axillary panicles: petals whitish yeUow, with 

 greenish veins: fruit depressed-globose, 5-6 mm. in diameter. T. he-sperinum 

 Greene, a large form. Hillsides and open woods: S.D. — Kans. — X.M. — Ariz. — 

 Ore. — B.C. Plain — Submoni. Je-JL 



2. T. longipes Greene. Erect single-stemmed shrub; leaves pinnately 3- 

 foUolate: leaflets thin, Ught green, the lateral ones broadly obhquely ovate, 7-10 

 cm. long, the terminal one almost orbicular, abruptly short-acuminate, coarsely 

 toothed: inflorescence racemose, lax, rarely with 1 or 2 branches below; petals 

 reflexed, greenish white, with dark veins. Canons: Utah. Submont. Je. 



Familt 7S. ACERACEAE. Maple Familt. 



Shrute or trees, with opposite, simple or compound leaves, without stip- 

 ules. Flowers p)erfect or jwlygamous, rarely dioecious or monoecious, 

 r^ular. Sepals 4 or 5, rarely 6-9, imbricate, often colored. Petals of the 



