82 NORTH AMERICAN FLORA [VoLuME 29 
1. Pernettia ciliata (Schlecht. & Cham.) Small. 
Gaultheria ciliata Schlecht. & Cham. Linnaea 5: 126. 1830. 
Pernettia pilosa G. Don, Gen. Hist. 3: 837, 1834. 
Perneitia ciliaris G. Don, Gen. Hist. 3: 837. 1834. 
? Pernettia Seleriana Loesener, Bull. Herb. Boiss. II. 3: 217. 1903. 
A low shrub with hirsute-setose branchlets; leaf-blades oblong to oval, varying to broadest 
above or below the middle, mostly 1-2 cm. long, acute or obtuse, crenate-serrate, smooth and 
shining above, dull and sparingly setose or glabrous beneath; calyx-lobes ovate to ovate- 
lanceolate, 3-3.5 mm. long; corolla 5-7 mm. long; stamens 4-5 mm. long; berries subglobose, 
6-7 mm. in diameter. 
‘TYPE LOCALITY: Mexico. 
DIstRIBUTION: Mexico. 
ILLUSTRATION: Jour. Hort. Soc. London 6: 268. 
2. Pernettia coriacea Klotzsch, Linnaea 24: 85. 1851. 
A low or depressed shrub with strigose-setose branchlets or glabrous; leaf-blades ovate, 
oblong-ovate, or oblong, mostly 1-2 cm. long, usually acute, serrate or crenate-serrate, shining 
above, dull and glabrous or nearly so beneath, reticulate in age; calyx-lobes ovate to lanceolate, 
3.5—4 mm. long; corolia 5-7 mm. long; stamens 3-4 mm. long; berries subglobose, 5-7 mm. in 
diameter. 
TYPE LOCALITY: Costa Rica. 
DIsTRIBUTION: Costa Rica and Panama. 
DOUBTFUL SPECIES 
PERNETTIA SETIGERA Klotzsch, Linnaea 24: 85. 1834. 
PERNETYTIA BUXIFOLIA Mart. & Gal. Bull. Acad. Brux. 91: 538. 1842. 
PERNETTIA OvATA Fernald, Proc. Am. Acad. 36: 496 (1901), is a Vaccinium. 
37. ARBUTUS L. Sp. Pl. 395. 1753. 
Shrubs or trees, with diffuse, ascending or erect stems, the bark of the trunk either fissured 
or smooth and exfoliating. Leaves alternate, persistent; blades narrow or broad, usually 
leathery, entire or toothed, mostly long-petioled. Flowers perfect, in terminal compound 
panicles, the panicles sometimes cluster-like. Calyx rather persistent; lobes 5, much longer 
than the tube, often thin-edged, equal or nearly so. Corolla white or pale, urceolate, of an 
ovoid or globular type; tube swollen; lobes 5, spreading or recurved, rounded, much shorter 
than the tube. Stamens 10, included; filaments dilated at the base, usually pubescent, un- 
appendaged; anthers broad, each with 2 slender awns. Disk usually 10-lobed. Ovary sessile, 
usually 5-celled; style columnar or subulate; stigma somewhat capitate, obscurely 5-lobed. 
Ovules numerous, at the inner angle of each ovary-cavity. Berry globular or depressed, or 
rarely slightly elongate, with a rough-granular coat. 
Type species, Arbutus Unedo L. 
Leaf-blades glabrous, sometimes glaucous. 
Leaf-blades entire or obscurely toothed, except on shoots. 
Ovary glabrous. 
Corolla globular-urceolate; leaf-blades more or less glaucous 
beneath; panicles many-flowered. 1. A. Menziesii. 
Corolla ovoid-urceolate; leaf-blades not glaucous; panicles few- : 
flowered. 2. A. arizonica. 
Ovary pubescent. 3. A. xalapensis. 
Leaf-blades sharply serrate or crenate-serrate. 4, A. prunifolia, 
Leaf-blades pubescent, at least beneath. 
Inflorescence-branches canescent or tomentose, with or without some 
gland-tipped hairs. 
Ovary pubescent. : 
Leaf-blades canescent or tomentose beneath, sometimes mainly 
along the midrib, at maturity. 
Calyx-lobes suborbicular or orbicular-ovate, obtuse; leaf- 
blades entire or obscurely toothed. 3. A. xalapensis. 
Calyx-lobes triangular, acute or acuminate; leaf-blades 
serrate, the teeth sometimes spine-tipped. 
. Spinulosa. 
Leaf-blades lanuginous beneath. 
. mollis. 
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