Flora of the Paloasc Region 101 



Calyx woolly: spines 4-6 cm. long: fruit red. C. piperi. 



Calyx nearly glabrous: spines 2-3 cm. long: fruit black. C. dougeasii. 



C. piperi Britton. A much branched shrub, 2-4 m. high: bark of older 

 stems light gray; that of the younger twigs light brown, the lenticels con- 

 spicuous; the branches of the season and the inflorescence strigose-villous: 

 thorns 3-5 cm. long, dark-brown, shining, straight or nearly so, somewhat 

 reflexed: petioles 1.5-2 cm. long, bearing several glands: leaf-blades broadly 

 oval in outline, sparingly strigose on both sides, dark and glossy above, 

 paler and dull beneath, incised and doubly serrate at or above the middle 

 but merely serrate on the cuneate base; teeth sharp and gland-tipped; apex 

 short, acuminate: corymbs 4-12-flowered: calyx-tube villous; sepals about 4 

 mm. long, prominently glandular-dentate: fruit spherical or nearly so, about 

 12 mm. in diameter, coral-red, sparsely strigose-pubescent, even at maturity. 

 Springy gravelly places, infrequent. 



C. douglassii Lindl. Shrubs, 2-6 m. high: spines stout, 2-3 cm. long: 

 leaves obovate, broadly cuneate at base, coarsely doubly dentate above the 

 middle, acute or obtuse, sparsely pubescent on both sides when young, 

 paler beneath, 2-5 cm. long; petioles short, glandless: corymbs usually 

 many-flowered: flowers about 12 mm. broad: calyx-tube glabrous, the lance- 

 late lobes pubescent: fruit black, smooth. Common along streams. 



165. PRUNUS. 



Small trees or shrubs, many with edible fruits: leaves alternate, 

 simple, usually serrulate: flowers white or rose-colored, solitary or 

 fascicled in the axils or in terminal racemes: calyx 5-lobed, free 

 from the ovary: petals 5, on the calyx-tube: stamens numerous, 

 pistil 1; style 1; ovary i-celled, 2-ovuled: fruit a drupe; seed 1, 

 rarely 2; endosperm none. 



Flowers racemose. P. demissa. 



Flowers corymbose. P. emarginata. 



P. demissa Dietrich. Shrub or small tree, 2-S m. high: leaves ovate or 

 oblong-obovate, cuneate, rounded or cordate at the base, sharply serrate, 

 5-10 cm. long, somewhat pubescent beneath; petioles 1-2 cm. long, appear- 

 ing after the leaves: calyx somewhat glandular: petals nearly orbicular: fruit 

 globose, dark purple, 5-6 mm. in diameter, not edible; stone globose. 

 Scarcely distinct from the eastern P. virginiana L. 



P. emarginata Walpers. Shrub or small tree, 3-S m. high: branches 

 and bark chestnut brown, with prominent lenticels: leaves narrow, ovate, 

 elliptical or obovate, obtuse or acute, cuneate at base, minutely serrate, 

 glabrous or pubescent beneath, 3-8 cm. long, short-petioled: corymbs few- 

 flowered, appearing with the leaves: flowers about 1 cm. broad: fruit oblong, 

 bright red, bitter; stone with a grooved ridge on one side. Summit of Cedar 

 Mountain. 



Family 38. LEGl'MINOSAE. 



Herbs or shrubs: leaves alternate, mostly compound, with 

 stipules: flowers regular or irregular (papilionaceous), perfect or 

 sometimes polygamo-dioecious, in spikes heads racemes or panicles: 



