266 POMACEAE (apple FAMILY). 



Glabrous throughout, at least at maturity. 



Leaves crenately serrate 1. A. abiifolia. 



Leaves inciaely serrate . 2. A. glabra. 



More or less pubescent. 



Leaves glabrous above, at least at maturity ... . 3. A. elliptica. 



Leaves pubescent on both faces. 

 Incisely serrate around the summit. 



Calyx and pedicels lanate-pubescent 4, A. Bakeri, 



Calyx (on the exterior) and pedicels green and glabrate . , 5, A. oreoijhilB. 

 Entire or crenately toothed 6. A. prumfolia 



1. Amelanchier alnifolia Nutt. T. & G. Fl. N. A. 1: 473. 1840. A shrub 

 or small tree, 2-4: m. high, glabrate throughout (including the calyx-lobes) 

 at least at maturity: leaves thickish, somewhat glaucous, elliptic, oval or ob- 

 ovate, very obtuse or even truncate, the base rounded, truncate, or subcor- 

 date, coarsely crenately serrate-dentate above the middle: raceme dense, 

 erect: petals oblanceolate, about 1 cm. long: pome purple, with bloom, 6-8 mm. 

 in diameter, sweet and juicy. — On stream banks; fronl Colorado to Nebraska 

 and the head waters of the Missom. 



la. Amelanchier alnifolia pumila (Nutt.) A. Nels. A low shrubby form 

 with small, nearly orbicular leaves, serrate-dentate to the base. A. pumila 

 Nutt. T. & G. Fl. N. A. 1: 474. 1840.— Infrequent; moist hillsides; eastern 

 Wyoming. 



2; Amelanchier glabra Greene, Fl. Fran. 52. 1891. Stout shrub, divari- 

 cately branched: leaves thin, deep green, obovate to orbicular, truncate or 

 retuse,' deeply and incisely serrate nearly to the base, 15-25 mm. long: calyx 

 as well as the leaves quite glabrous: petals ouneate-oblong: fruit depressed- 

 globose, crowned by the short triangular calyx-lobes. (A. polycarpa Greene, 

 Pitt. 4: 127. 1900.) — ^From southern Colorado to the Sierra Nevada. 



3. Amelanchier elliptica A. Nels. Bot. Gaz._ 40: 66. 1905. A small slender 

 tree-Uke shrub, growmg as scattered individuals rather than in clumps; 

 twigs slender, gray except at the ends which are purplish-black, with an in- 

 conspicuous beady resin: leaves elliptic, 2-4 cm. long, mcisely serrate to the 

 middle or lower, nearly glabrous above, softly lanate beneath when young, as 

 are also the slender petioles: flowers few, large: calyx woolly-pubescent; its 

 lobes deltoid-triangiilar, shorter than the tube, lanate on the inner face: 

 petals narrowly oblanceolate, 12-15 mm. long: fruit spherical. — Wet open 

 places in the moimtains; Colorado, Wyoming, and Utah. 



4. Amelanchier Bakeri Gfeene, Pitt. 4: 128. 1900. Shrubs or small trees, 

 growing in clumps; the branches rigid and divaricate, the younger ones puber- 

 ulent: leaves orbicular, 15-20 nmi. long, obtuse or truncate at both ends, 

 evenly serrate above the middle, both faces tomentulose; the stipules villous: 

 raceme short, dense, small-flowered: calyx vUlous-tomentose, the triangular- 

 lanceolate lobes equaling the tube: petals 5-10 mm. long. — Southern Col- 

 orado. 



5. Amelanchier oreophila A. Nels. Bot. Gaz. 40: 65. 1905. Low, intri- 

 cately rigid-branched, 1-2 m, highj growing in dense clumps; pubescence 

 short-lanate, some of it persisting till maturity, especially on the lower face 

 of the leaves: leaves elhptic to obovate, 2-4 cm. long, incisely dentate from 

 the middle to the rounded apex; the petioles scarcely half as long as the blade; 

 racemes short, dense: calyx-lobes subulate-triangular, glabrate outside, lanate- 

 pvibescent on the margins and inside: petals about 8 mm. long: pome globose, 

 purplish-black, developing but little pulp, remaining dry and insipid, matur- 

 mg late. — ^Dry stony hills and cafions; Colorado and Wyoming and probably 

 westward. 



6. Amelanchier prunifolia Greene, Ktt. 4: 21. 1899. Stems clustered and 

 bushy, 2-3 m. high; the branches rigid, with ashy bark: leaves coriaceous, pale 

 and glaucescent, but permanently obscurely puberulent, from oblong to ovate 

 or obovate, few-toothed around the obtuse summit: cyme few-flowered; 

 calyx-lobes lanceolate, elongated in fruit, hoary-tomentulosc: fruit on slen- 

 der pedicels about 2 cm. long. (Possibly the following from New Mexico are 

 the same: A. crenata Greene, Pitt. 4: 127, and A. rubescens Greene, Pitt. 1. c.) 

 — In the dry mountains; west central Colorado. 



