452 AMYGDALACEAE 



mm. long; fruit globose, 8-10 mm. in diameter, purplish or red. Cerasus demissa 

 Nutt. River banks: B.C.— Ida.— Calif.; apparently also Black Hills of S. D., 

 but there a mere low shrub (f. %rffeer^n Koehne) . Submont. My-Je. 



^^' P- "^elanocarpa (A. Nels.) Rydb. Tree or shrub up to 10 m. high; 

 twigs reddish brown, glabrous; leaves obovate or oval, abruptly acuminate at 

 the apex, mostly rounded at the base, rather firm, paler beneath, glabrous on 

 both sides; peduncles slender, glabrous or rarely minutely puberulent, many- 

 flowered; petals about 6 mm. long; fruit dark purple or black, 6-8 mm. thick, 

 sweet, slightly astringent, shorter than the pedicels. Cerasus demissa rnelano- 

 carpo A Nels. Hills and river banks: Alta.—N.D.—Kans.—N.M.— Calif. 

 — rJ.(^. Flam — Submont. My-Je. 



2. EMPLECTOCLAdUS Torr. Wild Almonds. 



Low shrubs, with divaricate, spinescent branches. Leaves fasciculate on 

 short branchlets, entire. Flowers 1-3, in axillary umbels, perfect. Hypanthium 

 carapanulate, hairy withm. Sepals and petals 5, imbricate. Stamens 10-15; 

 tilaments slender, distinct. Drupe pubescent, with rather dry exocarp, which 

 splits on one side. Stone bony, flattened. 



■J 



1. E. fasciculatus Torr; 



branches 



, . , ---'• -■'■ oiiii^iy w.o-x 111. iiigii, Willi uivaricaie orancues, 



more or less spinescent ; leaves fascicled on short branchlets, spatulate, nearly sessile, 

 &-iU mm long finely puberulent or glabrate; flowers sessile or nearly so; petals 

 hnear-oblanceolate, white, 3 mm. long; stamens 10-15; fruit subglobose, pubes- 

 cent, about 1 cm. long. Prunus fasciculata A. Gray. Amygdalm fasciculatus 

 Greene. Desert regions: Calif.— s Utah— Ariz. L.Son. Mr-Ap. 



Family 63. MIMOSACEAE. Mimosa Family. 



Herbs, shrubs, or trees, usually with twice or thrice pinnately compound 

 leaves with stipules, the latter often modified into spines. Flowers mostly 

 perfect, regular, m heads or spikes. Sepals 3-6, partly united, valvate. 

 Petal, as many, valvate, distinct or partly united. Stamens of the same 

 number, twice as many, or numerous. PistU solitary, in fruit becoming a 



legume. 



Le^S 4""!^, Jitlr^ ''.°* separating from the continuous margins, 

 l^ebuines 4-angled; valves separating from the continuous margins. 



1. ACTJAN. 



2. MOHONGIA 



imarmed 



ACUAN Aledic. Phairie Mimosa. 



numeroiiflpXt« #1 *"'^'' .^^'''^ly soai,ewhat shrubby. Leaves bipinnate, with 

 the lower nn.ff; ^ ""T""' "" P^duncled heads or head-like spikes, perfect or 

 5dtZct nr ditlT''^*-; T'^.^^ri^ ^'^*^«^<^ petals. Calyx 5-lobed^. Petals 

 disSt or n.Jw^ ^ T^^"^ ^* *^' ^^^- stamens 5 or 10. exserted; filaments 

 distinct or nearly so. Ovules numerous. Pod elongate, unarmed. [Desmanthus 



1. A. Uhnoensis (Michx.) Kuntze. Erect 

 h glabrous or nearly so ; leaves bipinnate, wit 

 > hnear-oblong. 2 5-3.5 mm. long; peduncles 

 '"■ stamens o; pods 4-6 



20-30 



N.M.-S.D. PlJn Mi-^Je ^'^^' ^^'^^ Tenn.-Fla.-Tex. 



2. MORONGIA Britton. Sensitive Brier 



mous, in axillary peduncled Ss Cal^^ 4- nr ^ i PT'*""^ P^'^^f* or polyga- 

 to about the mTddle. Stamens tl0^i^.tr«^-i?ll Petals 4 or 5._ united 



Ovules 



valves .epIrltinT from tbTm^-giS'^-ISSSySd™';^^^^^^^^ 



