142 BOTANICAL GAZETTE [august 



This species is singularly like C. Bolanderi Wats., except for the much 

 larger leaves and the large broad leaflets. The fruit, however, is much more 

 flattened dorsally and the pericarp much thickened with strengthening tissue. 

 It is extremely improbable, however, that the species heretofore supposed to 

 be restricted to the tide-land marshes of Suisun, Cal., should next appear in the 

 lava lands of Idaho. 



The plants are large, stately, well branched, and conspicuous objects 

 among the underbrush that borders Rock Creek, near Twin Falls. The stem 

 at the base is often 4-5 cm. in diameter. The soil in this neighborhood is the 

 well known volcanic ash that has proven so well suited to the production of 

 apples. Nelson and Macbride's no. 1315, July 25, 1911, is the type. 



Cynomarathrum Macbridei, n. sp. — Glabrous: acaulescent : 

 root woody, surmounted by a branched caudex which is clothed 



Fig. 2. — Cynomarathrum Macbridei A. Nels., n. sp. 



with dead leaf bases: leaves narrowly oblong, bipinnate, 3-7 cm. 

 long including the very slender petiole; the pinnae often pinna tely 

 cleft; the leaflets elliptic, very numerous and minute, only 1-2 mm. 

 long: scapes 1-3 times as long as the leaves, slender: the flowers 

 closely capitate in a small cluster, white: rays few and short (only 



) even in fruit: pedicels nearlv wanting: seeds flattened 



mm 



dorsally, all of the ribs thin-winged, the lateral more than half as 

 broad as the body, the others not much narrower: oil tubes 3-5 in 



al side: calyx lobes evident : 



commissu 



the stylopodium low and flat (fig 2). 



This species is decidedly distinct from any of the known species in this 

 genus. Some of its characters suggest the genus Phcllopterus, but the char- 



