288 NORTH AMERICAN FLORA [VoLUME 22 
14, Ivesia Tweedyi Rydberg, sp. nov. 
Perennial, with a thick root and a short caudex: stems several, erect, 1.5-2 dm. high, 
glandular-puberulent ; basal leaves 8-10 cm. long, pinnate, with 10-12 pairs of crowded leat- 
lets, glandular-puberulent ; leaflets 5-8 mm. long’, dissected to near the base into narrow 
divisions; stem-leaves few and reduced; inflorescence cymose with strongly ascending 
branches ; hypanthium cupulate, in fruit 3 mm. wide, glandular puberulent and slightly 
silky-pilose ; bractlets narrowly linear, about 1.5 mm. long; sepals triangular-lanceolate, 
about 2.5 mm. long; petals yellow, spatulate, slightly exceeding the sepals; stamens 5; 
filaments filiform. 
Type collected in the Yakima Region, Washington, in August, 1883, 7. Tweedy (herb, 
Columbia Univ.). . 
DISTRIBUTION : Eastern slope of the Cascades, Washington. 
15. Ivesia scandularis Rydberg. 
Horkelia scandularis Rydb. Mem. Dep. Bot. Columbia Univ. 2: 150. 1898. 
Ivesia pygmaea S. Wats.; Rydb. Mem. Dep. Bot. Columbia Univ. 2: 150,asasynonym. 1898. 
Cespitose perennial, with a thick woody root; stems several, less than 1 dm. high, de- 
cumbent, slightly glandular-puberulent, nearly leafless; basal leaves numerous, 2-5 dm. 
long, pinnate with numerous crowded and somewhat imbricate leaflets, glandular-puberu- 
lent, light green, often yellowish; leaflets about 2 mm. long, divide to the base into thick 
oblong segments; cyme corymbiform; hypanthium cupulate or almost saucer-shaped, in 
fruit 4 mm. in diameter; bractlets oblong, about half the length of the ovate sepals; 
petals obovate, a little exceeding the sepals; stamens 5, nearly equaling the sepals; 
pistils 5-10. - 
TYPE LOCALITY: White Mountains, California. 
DISTRIBUTION: Known only from the type locality. 
ILLUSTRATION: Mem. Dep. Bot. Columbia Univ. 2: fl. 91, f. 5-9. 
16. Ivesia mutabilis (Brand.) Rydberg. 
Horkelia mutabilis Brand. Bot. Gaz. 27: 446. 1899. 
Perennial, with a very thick woody root and short caudex; stems several, 3 dm. high, 
erect, branched above, somewhat villous or nearly glabrous; stipules ovate-lanceolate ; 
basal leaves numerous, 12-20 cm. long, pinnate with numerous leaflets, villous with short 
hairs and somewhat glandular; leaflets sessile, more or less imbricate, 2-5 mm. long, 
usually divided to near the base into obovate-oblong divisions; cyme much branched, 
open; hypanthium 4 mm. broad, glandular-puberulent and sparingly hirsute; bractlets 
lanceolate, half as long as the broadly lanceolate sepals, which are 4-5 mm. long; petals 
yellow, shorter than the sepals, oblanceolate; stamens 5; filaments filiform, 2 mm. long; 
pistils 2-7. 
TYPE LOCALITY: Charleton Mountains, Nevada. 
DISTRIBUTION: Mountains of Nevada and Utah. 
17. Ivesia lycopodioides A. Gray, Proc. Am. Acad. 6: 530. 1865. 
Ivesia Gordonii lycopodioides S. Wats. Bot. Calif. 1: 183. 1876. : 
Potentilla Gordonii lycopodioidesYGreene, Pittonia 1: 106. 1887) Jeps. teal PG IBE, 
Horkelia lycopodioides Rydb. Meth. Dep. Bot. Columbia Univ. 2: 151. 1898. 
Densely cespitose perennial, with a deep woody root; stem scapose, glabrous, less than 
5 cm. high; basal leaves very numerous and crowded, about 3 cm. long, glabrous, 
with numerous minute crowded and more or less imbricate leaflets, these only 1-2 mm. 
long, 3-cleft into oval thick segments; cyme few-flowered and corymbose; hypanthium 
cupulate or saucer-shaped, about 3 mm. in diameter, glabrous or slightly puberulent; 
bractlets oblong, about two-thirds as long as the ovate sepals, which are 2 mm. long; petals 
yellow, oblong-oblanceolate, about equaling the sepals; stamens 5, with slender but short 
filaments; pistils 6-12. 
TYPE LOCALITY: Mount Dana, Sierra Nevada, California. 
DISTRIBUTION : Sierra Nevada. 
ILLUSTRATION: Mem. Dep. Bot. Columbia Univ. 2: pl. 92, f. 1-6. 
