298 CALIFORNIA ACADEMY OF SCIENCES. 



50. Oxytenia acerosa Nutt., Journ. Acad. Phila., N. S., 

 i, 172. 



Habitat: "Rocky Mountains, near Upper California." 

 This beautiful plant was always found near alkaline 

 springs. It grows to the height of five or six feet, filling 

 the air with the fragrance of its lilac - scented flowers. 

 The large yellow panicles are conspicuous, and can be 

 recognized from afar. The lower leaves are not rigid, 

 as in the type description, and not at all revolute. They 

 have 5-7 lax alternate segments of varying lengths, some 

 about 12 cm. long. The upper leaves are more rigid. 

 Collected at an alkaline spring near the junction of Mon- 

 tezuma Canon with the San Juan River; seen also along 

 McElmo Creek and on Epsom Creek near one of the 

 springs of bitter water. 



51. Dicoria paniculata n. sp. Plate xlv. 



Annual, 3-4^2 dm. high, branched from the base, 

 sometimes simple, branches opposite, below becoming 

 alternate, spreading outwards and upwards; whole plant 

 hispid-canescent, with jointed, appressed hairs; leaves 

 lanceolate, obtuse, entire, or sparingly dentate, from 8 cm. 

 long to less than 2 cm., with petioles about 1 cm. long, 

 lowest leaves 3-nerved, upper i-nerved, with conspicuous 

 white veins; heads numerous, 4 mm. long (excluding the 

 ripe akene which extends 2 mm. beyond the involucre, 

 half covered by the large, broad bract), racemose-panicu- 

 late at the ends of the branches and stem, deflexed on 

 slender pedicels ; involucre campanulate, of 5 nearly equal, 

 oblong bracts, separate almost to the base; large bracts 

 covering the akenes, truncate or obcordate, orbicular, 

 glandular, less hairy than the others, membranous at the 

 edge, ciliate; fertile flowers two, frequently but one ma- 

 turing; staminate flowers 9-10; anthers five, sometimes 

 fewer, extending beyond the corolla after anthesis ; corolla 



