210 Charles V. Piper. 
barium. This differs from any other American species in the small size 
of the fruit and the relatively few prickles. 
196. Ambrosia artemisiaefolia subsp. diversifolia Piper, l. c.,p. 551. 
Leaves becoming progressively less deeply lobed upward, those of 
the upper third of the plant mostly entire, these ovate-lanceolate or lan- 
ceolate, acute, narrowed abruptly to a subsessile base, 3-nerved. 
On the gravelly banks of Almota Creek at Almota, Piper, August 26, 
1894 (no. 1837). At this place it seems unquestionably to be native. 
The entire or subentire upper leaves present a peculiar characteristic 
which does not seem to be approached in any eastern specimens. The 
plant may represent a distinct species, but in the absence of more abun- 
dant materiai it seems best to treat it as above. 
197. Grindelia nana var. columbiana Piper, |. c., p. 556. 
Grindelia discoidea Nutt. Trans. Am. Phil. Soc., VII, 315; 1840, not 
Hook. & Arn. 1836. —  Grindelia nana var. discoidea A. Gray, Syn. Fl. 
ed. 2, I?, 119; 1884. — Orgeon and Washington. 
198. Chrysothamnus nauseosus var. graveolens (Nutt.) Piper, l. c., p. 559. 
Chrysocoma graveolens Nutt. Gen., 11, 136; 1818. — Bigelovia graveolens 
A. Gray, Proc. Am. Acad. VIII, 645; 1873. — Chrysothamnus speciosus 
Nutt. Trans. Am. Phil. Soc., VII, 323; 1840. — British Columbia to Dakota, 
south to California and New Mexico. 
199. Hoorebekia carthamoides (Hook.) Piper, 1l. c., p. 559. 
Pyrrocoma carthamoides Hook. Fl. Bor. Am., I, 307, pl. 107; 1833. — 
Aplopappus carthamoides A. Gray, Proc. Acad. Philadelphia, 65; 1863. — 
Washington, Oregon and Idaho. 
200. Hoorebekia carthamoides var. Cusickii (A. Gray) Piper, l. c., p. 560. 
Aplopappus carthamoides var. Cusickii A. Gray, Syn. F1, I?. 126; ges. 
— Pyrrocoma Cusickii Greene, Erythea, II, 59, 1894. — Washington and 
Oregon. 
201. Hoorebekia racemosa (Nutt.) Piper, l. c., p. 560. 
Homopappus racemosus Nutt. Trans. Am. Phil. Soc., VII, 332; 1840. 
— Pyrrocoma racemosa Torr. & Gr. Fl., Il, 244; 1842. — Aplopappus race- 
. mosus Torr. in Sitgreaves Rep., 162; 1853. — British Columbia to Saskat- 
chewan, south to Nevada. 
202. Hoorebekia hirta (A. Gray) Piper, l. c., p. 560. 
Aplopappus hirtus A. Gray, Syn. FI., I?, 127; 1884. — Pyrrocoma hirta 
Greene, Erythea, ll, 69; 1894. — Washington, Oregon, and Idaho. 
203. Hoorebekia Hallii (A. Gray) Piper, l. c., p. 560. 
Aplopappus Hallü A. Gray, Proc. Am. Acad, VIII, 389; 1872. — 
Washington and Oregon. 
204. Hoorebekia Lyallii (A. Gray) Piper, |. c., p. 560. 
Aplopappus Lyallü A. Gray, Proc. Acad. Phila, 1863, 64; 1863. — 
British Columbia to Montana and Oregon. . 
205. Hoorebekia lanuginosa (A. Gray) Piper, 1. c., p. 560. 
Aplopappus lanuginosus A. Gray in Torr. Bot. Wilkes Exped., 347; 1874. 
— Stenotus lanuginosus Greene, Erythea, II, 72; 1894. — Washington and 
Oregon. 
