261 
POYENTILLA LATERIFLORA DN. Sp. 
~P. millegrana laterifiora Engelm. Mss. in herbarium. 
Annual or biennial; stems often several from the root, 3-5 
dm. high, terete, finely and rather densely glandular-pubes- 
cent, often tinged with red or purple, simpler than in related spe- 
cies and with erect branches. Stipules small, ovate or oblong, en- 
tire or toothed. Leaves all ternate, the lower on petioles 2-10 
cm. long, more or less hairy; leaflets broadly obovate, coarsely 
crenate, 2-4 cm. long and 1-3 cm. wide. Flowers small, about 5 
mm. in diameter, on pedicels 5-15 mm. long from the axils of up- 
per leaves, making the branches resemble leafy racemes. Calyx 
glandular-pubescent in fruit, about 14 cm. in diameter. Bractlets 
ovate-lanceolate or oblong, acute, a little shorter than the ovate, 
acute sepals. Petals yellow, obovate-cuneate, sometimes slightly 
emarginate, shorter than the sepals. Stamens about 10; pistils 
very numerous; style terminal, thickened and glandular at the 
base ; ripe achenes whitish, smooth. 
It most resembles P. mllegrana and generally bears that name 
in our herbaria. Sometimes it is labelled P. Norvegica, which it 
resembles in the form of the leaf and general habit, but is a much 
more slender plant and has much smaller petals and fruiting 
calyx. From P. millegrana it differs in the simpler and erect 
stems, erect branching, falsely racemose inflorescence, broader and 
more hairy leaflets, and more glandular stems. Most specimens 
of what has been regarded as P. vivalis millegrana from the Pacific 
States belong to this species.. It ranges from California and 
British Columbia to Assiniboia and Arizona. The following 
specimens have been examined: 
Utah: Henry Engelmann (Simpson’s Exp.), 1859. 
Arizona: Edw. Palmer, no. 143, 1877; E. O. Wooton, 1892. 
Nevada: Watson (King’s Exp.), no. 324, 1867, in part, vick 
Specimens from Unionville. . 
California : Coville & Funston, no. 1763, 1891: Wilkes’ Expe- 
dition, no. 1647; J. G. Lemmon, no. 85, 1875; S. B. Parish, no. 
3153, 1894; M. E. Jones, no. 2700, 1881. 
Oregon: J. H. Bartholf, no. 29, 1875; T. J. Howell, 1881. 
Idaho: A. Isabel Mulford, 1892. 
Montana: Mrs. Moore, 1894; P. A. Rydberg, 1895. 
British Columbia: John Macoun, 1889. 
Assiniboia : John Macoun, no. 10482. 1895. 
