Eastwoop: New Species oF WESTERN PLANTS 489 
ing at base and imbricated: cauline leaves few, 5 mm. long, from 
spatulate to narrowly oblong, obtuse, sessile, appressed to the 
stem, entire or with obtuse teeth: flowers corymbose, fragrant : 
sepals greenish or purplish black, two narrowly oblong, obtuse, 4 
mm. long, 1-1.5 mm. wide, the other two broader, spurred at 
Arabis McDonaldiana. A, petal. 8, inner sepals. CC, outer sepals. 
base, membranously margined : petals crimson, oblanceolate, taper- 
ing to the base with the distinction between blade and claw not 
evident, truncate or obtuse at apex, g mm. long, about 3 mm. 
broad: stamens with ribbon-like filaments, the longest as long as 
the sepals; anthers narrowly oblong, yellow, 1.5 mm. long : 
siliques 3-4 cm. long, erect-spreading, becoming racemose with 
pedicels 1 cm. long: style 1 mm. long. 
This beautiful and fragrant Aradéis was collected by the author 
in the northern part of Mendocino County, California, on Red 
Mountain, May 26, 1902. It is named in honor of Captain James 
M. McDonald, to whom botanists of the Pacific coast are indebted 
for his generosity in publishing Greene’s West American Oaks and 
the author is personally grateful for aid in her work. 
