554 RHAMNACEAE 



Shrub not spinose; native species. 



Flowers 4-merous; petals present; seeds 2, grooved; leaves not strongly veiny. 



Leaves broadly lanceolate, acuminate with a blunt apex. 2. R. lanceolata. 



Leaves narrowly lanceolate, not acuminate. 3. R Smithii 



l^ lowers 5-merous, apetalous; seeds 3. scarcely grooved; leaves strongly vemy. 



^'"p^H^.^if^i^^^*^ umbels or corymbs, perfect; winter-buds not scalV, "pubescent. 

 P^H^J^n S o?^5 ^^^^ the pedicels ; leaves merely caUous-dentlculate. 5. R. Purshiana . 

 I'eduncles shorter than the pedicels, sometimes almost none; leaves finely but dis- 

 tmctly serrate. . g, ^ beiulaefolia. 



1. R. carthartica L. Shrub or low tree, 2-7 m. high, with-rough bark; 



leaves petioied; blades glabrous or nearly so, broadly ovate or oval, 3-6 cm. long, 

 crenate; flowers dioecious, greenish, 4-merous; petals lanceolate; drupe globose, 

 about 8 rnm. in diameter; seeds 3-4, grooved. Around dwellings: Ont.— Va.— 

 v.^olo.; cult, and occasionally escaped; native of Eu. Je. 



2. R. lanceolata Pursh. Unarmed shrub or small tree; leaves short-petioled ; 

 blades lanceolate or ovate-lanceolate, acuminate, with a blunt apex, minutely 

 crenate, glabrous above, puberulent beneath, 3-8 cm. long; flowers 2-3 in the 

 axils ot the leaves, greenish, dioecious; petals lanceolate, shorter than the sepals; 

 drupe black, 6 mm. in diameter. Wet ground: Pa.— Ala.— Tex.— Neb. Plain. 



My-Je. 



3. R Smithii Greene. Unarmed shrub, with densely leafy branches and 

 yellowish or grayish bark; leaves short-petioled; blades yeUowish green, lance- 

 olate, obtaise or acutish, finely crenate, 2-4 cm. long; flowers greenish, dioecious; 

 lr\^ subglobose, 6-7 mm. in diameter, black. Mountain valleys: Colo.— 

 N.M.— Ariz.— Ltah. Submont. Je. 



4. R. alnifolia L'Her. Unarmed shrub, 1-2 m. high; branches gray, finely 

 pubescent; leaves short-petioled; blades oval or elliptic, from obtuse to some- 

 wnat acuminate, coarsely crenate-serrate, finely pubescent when young, soon 

 glabrate, 3-10 cm. long, strongly veined; flowers soUtary or 2 or 3 umbellate; 



sepals spreading; drupe black, 7-8 mm. in diameter. Swamps: Me.— N.J.— 

 Wyo.— n Cahf.— B.C. Submont. My-Je. 



5. R. Purshiana DC. Unarmed shrub or small tree, 3-10 m. high; leaves 

 snort-pet loled; blades broadly oval, rounded or subcordate at the base, obtuse 

 or abruptly short-acuminate, 3-12 cm. long, short-villous beneath and on the 

 vems above; flowers 5-merous, perfect; petals minute; drupe depressed-globose, 

 purple or black 3-seeded; seeds plano-convex, without a groove. Woods: 

 Mont.— Cahf.— B.C. Submont. My-Je. 



6. R. betulaefolia Greene. Unarmed low shrub, 1-3 m. high; branches 

 pubescent; leaves short-petioled; blades oval or elliptic or obovate-lanceolate, 

 acute or obtuse at the apex, 5-10 cm. long, puberulent and in age glabrate 

 above, pubescent beneath, especially on the strong veins; flowers corymbose, 

 tew; drupe purplish black, 8 mm. broad, 3-seeded. Under cliff's and along 

 streams: N.M.— Ariz.— a Utah. Son. —Submont. My-Jl. 



2. CEANOTHUS L. New Jersey Tea, Mountain Laurel. 



Snow Brush, Deer Brush. 



Shrubs or small trees, often with spinulose branches. Leaves alternate, 

 comnioniy 3-ribbed; stipules caducous. Flowers perfect, crowded in terminal 

 panicles, cymes or umbels. Hypanthium urn-shaped, filled by the disk. Sepals 

 6, deciduous, white. Petals 5, inserted under the disk, long-clawed and strongly 

 hooded, btamens 5; filaments filiform, exserted. Ovary immersed in the disk, 

 ji-celled. btyles short, united below; stigmas 3. Fruit dry, 3-lobed, separating 

 mto 3 nutlets. Seeds flattened; endosperm fleshy. 



Leaves altemate, tliin, triple-nerved. 



Leaf-blades rounded-oval, often cordate at the base, closely glandular-dentate or 



Peduncles often naked from lateral buds; leaves sparingly pubescent beneath. 



soon glabrate. 



>ng; young 



T ^ ^ n ^ , 1. C. sanguineus 



i^eaves 1-2.5 cm. l<m«; yoimg branches finely puberulent. 2. C. Martini. 



