272 NORTH AMERICAN FLORA [VoLuME 22 
3. Horkelia elata (Greene) Rydb. Bull. Torrey Club 25: 54. 1898. 
Potentilla elata Greene, Pittonia 1: 100. 1887. 
Potentilla californica elata Greene, Fl. Fran. 1: 66. 1891. 
Stems rather numerous from a perennial root, quite slender, 0.5-1 m. high, softly but 
sparingly glandular-villous; stipules ovate-lanceolate, about 1 cm. long; basal leaves 
numerous, slender-petioled, pinnate; leaflets 7-11 pairs, thin and softly hairy, obovate or 
broadly cuneate-flabelliform, repeatedly cleft and incised into very narrow segments, the 
upper confluent; stem-leaves similar, but smaller, and with fewer leaflets; cyme open; 
pedicels short, 2-6 mm. long; hypanthium campanulate, softly hairy and glandular, in 
fruit 5-8 mm. in diameter; bractlets and sepals triangular-lanceolate, mostly entire, the’ 
former 3-8 mm. long, usually exceeding the sepals; petals white, oblong, about equaling 
the sepals. 
TYPE LOCALITY: Shady banks of the upper Napa River, a little above Calistoga [California], 
DISTRIBUTION: Western slope of the Sierra Nevada. 
ILLUSTRATION: Mem. Dep. Bot. Columbia Univ. 2: pi. 58. 
4. Horkelia glandulosa Eastw. Bull. Torrey Club 32: 195. 1905. 
Perennial, with a woody rootstock; stems several, 6 dm. high, stout and coarse, finely 
viscid-glandular throughout and softly villous with silky hairs; basal leaves often 4 dm. 
long, with about 5 pairs of leaflets; leaflets elliptic to orbicular in outline, cuneate at the 
base, laciniately lobed and toothed, the larger 4 cm. long; cauline leaves smaller; stipules 
resembling the leaflets but smaller; cymes terminal or axillary; central flower pedicelled, 
the lateral ones subsessile; hypanthium urceolate, 5 mm. long; sepals 5 mm. long and 3 
mm. wide, glandular-hairy without, attenuate; bractlets similar but narrower ; petals white, 
oblong, 6 mm. long, 4 mm. wide; filaments broad, as long as the anthers. 
TYPE LOCALITY: Laytonville, Mendocino Co., California. 
DISTRIBUTION : Known only from the type locality. 
II. Cuneatae. Stem lessleafy than in the preceding group. Basal leaves pinnate, with 
4-15 pairs of rather small obovate or cuneate leaflets, which are in all but one species less 
than 2 cm. long. Inflorescence rather openly cymiose, several- or many-flowered. Hypan- 
thium cupulate or saucer-shaped; bractlets ovate or lanceolate, not exceeding the sepals. 
Stamens with broad uniform filaments. Pistils many. 
5. Horkelia Micheneri (Greene) Rydb. Bull. Torrey Club 
25: 54. 1898. 
Potentilla Micheneri Greene, Erythea 1: 5. 1893. 
Potentilla tenuiloba Micheneri Jepson, Fl. W. Middle Calif. 283. 1901. 
Stems several from a deep perennial root, slightly hirsute, brown, simple or branched 
below, ascending or erect; stipules lanceolate, mostly entire, 5-10 mm. long; basal leaves 
numerous, slightly tabeceent or glabrate, dark-green, pinnate, with 10-16 pairs of cuneate 
leaflets which are about 1 cm. long, flabelliform, dissected from the end to the middle into 2-4 
segments, these again divided into rather divergent, oblong, obtuse lobes; stem-leaves sim- 
ilar, but smaller and with fewer leaflets; cyme open, with divergent branches; hypanthium 
hirsute, cupulate, in fruit 4-5 mm. in diameter; bractlets linear-lanceolate, much smaller 
than the broadly lanceolate sepals, which are 3-4 mm long; petals yellowish or white, spat- 
ulate, a little exceeding the sepals, more or less deeply notched at the apex. 
TYPE LOCALITY: Southern flanks of Mt. Tamalpais, California. 
DISTRIBUTION : Mt. Tamalpais. 
ILLUSTRATION: Mem. Dep. Bot. Columbia Univ. 2: pJ. 59. 
6. Horkelia Wilderae Parish, Bot. Gaz. 38: 460. 1904. 
Cespitose, sparsely pubescent perennial, from a perpendicular root ; stem slender, 2 dm. 
high, much branched above; stipules lanceolate, entire or 1-2-toothed at the base; basal 
leaves 6-8 cm. long; leaflets 5 or 6 pairs, cuneate, 5 mm. long, deeply incised, the lobes 
oblong; upper cauline leaves unifoliolate, deeply dissected ; cyme diffuse; flowers numerous 
