94 NORTH AMERICAN FLORA [Vorume 29 
. Leaf-blades not revolute on the margins. 23. U. myrtifolia. 
Pericarp thin, very clammy on the surface, without granular pulp; nutlets 
united into a rounded or ovoid longitudinally striate stone. 24. U. glauca. 
1. Uva-ursi Uva-ursi (L.) Britton; Britt. & Brown, Ill. Fl. ed. 2. 
2: 693. 1913. 
Arbutus Uva-ursi L. Sp. Pl. 395. 1753. 
Uva-ursi procumbens Moench, Meth. 470. 1794. 
Matrania Uva-ursi Desv. Jour. Bot. Desv. II. 1: 37. 1813. 
Uva-ursi buxifolia S. F. Gray, Nat. Arr. Brit. Pl. 2: 400. 1821. 
Arctostaphylos Uva-ursi Spreng. Syst. 2: 287. 1825. 
Arctostaphylos officinalis Wimm. & Grab. FI. Siles. 1: 391. 1827. 
Arctostaphylos procumbens Patze, Meyer & Elkan, Fl. Preuss. 188. 1850. 
Daphnidostaphylis Fendleriana Klotzsch, Linnaea 24: 80. 1851. 
Arctostaphylos Uva-ursi alba Cockerell, W. Am. Sci. 6: 11. 1889. 
A low prostrate shrub, with rooting branches 2-5 dm. long, tardily exfoliating, reddish- 
brown bark, and glabrous or sparsely tomentose branchlets; leaf-blades spatulate to obovate, 
15-20 mm. long, rounded or emarginate at apex, not at all mucronate, tapering at the base, 
thin-coriaceous, bright-green and glabrous above, paler beneath, the margins thin and more 
or less revolute; petioles 2-3 mm. long; flowers in short, few-flowered racemes; rachis sparsely 
tomentose; bracts triangular, acute, 2 mm. long, persistent, nearly or quite glabrous; pedicels 
slender, 3-4 mm. long, glabrous; calyx-lobes broadly ovate, glabrous or rarely sparsely pubes- 
cent on the margins; corolla 4-6 mm. long, white or tinged with pink; ovary glabrous; fruit 
globose, bright-red, with a bitter astringent pulp; nutlets separable, rounded on the back and 
1-nerved. 
Tyre LocaLiry: Northern Europe. 
DISTRIBUTION: Arctic America, from Labrador to Alaska, and southward to Virginia, Illinois, 
New Mexico, and the northern boundary of California; also in Europe and Asia. 
ILLUSTRATIONS: A. Dietr. Fl. Bor. #1. 349; Baxter, Brit. Bot. pl. 502; Britt. & Brown, Ill. Fl. 
f. 2776; ed. 2. f. 3249; Meehan, Nat. Fl. 1: #1. 20; Mathews, Field Book 329. 
2. Uva-ursi nevadensis (A. Gray) Abrams. 
Arctostaphylos nevadensis A. Gray, Syn. Fl. N. Am. 2!: 27. 1878. 
A low depressed shrub, forming mats, with decumbent branches 3-6 dm. long, exfoliating, 
reddish-brown bark, and more or less tomentose branchlets; leaf-blades ovate to oblanceolate, 
commonly narrowly obovate, 15-25 mm. long, rounded to acutish at the apex, prominently 
mucronate, coriaceous, bright-green on both surfaces, glabrous or sparsely puberulent; petioles 
3-5 mm. long, puberulent or glabrous; flowers in very short, simple or few-branched racemes; 
bracts firm, abruptly acuminate above the base, 3 mm. long, pubescent; pedicels slender, 4-5 
mmm. long, glabrous or rarely sparsely puberulent; calyx-lobes broadly ovate, glabrous, or 
short-ciliate on the margins; corolla 7-8 mm. long; ovary glabrous; fruit deep-brown, depressed- 
globose, with copious acid pulp; nutlets readily separable, rugosely roughened. 
TYPE LOCALITY: Sierra Nevada, California, at elevations of 2650 to 3340 meters. 
DistRiBUtTION: A subalpine species of the Cascade Mountains and the Sierra Nevada, from 
Washington to California. 
3. Uva-ursi cratericola (Donn. Smith) Abrams. 
Arctostaphylos pungens cratericola Donn. Smith, Bot. Gaz. 16: 13. 1891. 
Arctostaphylos cratericola Donn. Smith, Bot. Gaz. 55: 437. 1913. 
A prostrate shrub, with more or less rooting branches, tardily exfoliating roughened 
bark, and sparsely puberulent branchlets; leaf-blades broadly obovate to oblanceolate, 12-18 
mm. long, 10 mm. or Jess wide, firm-coriaceous, bright-green and shining on both surfaces, 
sparsely tomentose toward the base, obtuse or acute, pungently pointed; petioles flattened, 
2-3 mm. long; flowers in very short stbcapitate racemes; bracts triangular, acutish, 3 mm. 
long, puberulent; pedicels scarcely equaling the bracts in flower, glabrous; calyx-lobes rounded, 
densely short-ciliate on the margins; ovary glabrous; fruit unknown. 
Type LOCALITY: On rocks in the crater of Vocan de Agua, Guatamala. 
DistRrBuTION: Known only from the type locality. 
