HEMIONZAT COMPOSITE 349 



CALYCADENIA 



glandular-bearded. Bracts of the involucre in a single series, ob- 

 long or lanceolate, concave or convolute and partly enclosing the 

 ray-achenes. Receptacle flat, chaffy throughout, the scales of the 

 outer series united. Style-appendages of the disk-flowers linear 

 or subulate, acute, very hispid. Achenes glabrous : those of the 

 ray obovoid, gibbous or slightly obcompressed, convex on the 

 back, slightly stipitate, the apex mostly oblique and terminated 

 with a small often papillose exserted or beaked areola; of the disk 

 sterile or abortive, oblong, 5-7-nerved. Pappus none. 



H. luzulaefolia DC. I. c- Tomentose-canescent: stems erect, 6-18 

 inches high, corymbosely branched above, the branches and involucre hir- 

 sute and somewhat viscid : leaves linear-lanceolate, silky-villous, not 

 glandular, 1-5 inches long by 2-4 lines broad, the lower elongated, tapering 

 to the base, denticulate, 3-5-nerved, sometimes opposite : heads numerous, 

 3-4 lines broad, many-flowered: involucre hemispherical, its bracts rather 

 shorter than the disk, with short and broadish herbaceous tips : rays 5-10, 

 rather large, white to pinkish : scales of the receptacle united into a cup. 

 Open grounds and fields, southern Oregon and California. 



H. Clevelandi Greene Bull. Torr Club ix, 109. Stems stoutish, 10-20 

 inches high, branching from near the base, villous with long spreading 

 hairs, glandular above : leaves norrowly linear, 1-nerved, silky beneath : 

 heads racemosely or spicately disposed along the slender branches : rays 

 white. In fields and open places, southern Oregon and California. 



53 CALYCADENIA DC, Prodr. v, 695. 



Slender annuals with rigid chiefly alternate narrowly linear or 

 subulate 1-nerved leaves with revolute margins, the upper ones 

 usually terminated by a large saucer-shaped gland. Heads 

 many-flowered ; the ray-flowers 3-5, pistillate, 3-lobed or 3-parted, 

 with slender tube ; disk- flowers tubular, perfect but mostly infer- 

 tile. Involucre leafy-bracteate at base, its bracts in a single series, 

 concave, partly enclosing the ray-achenes. Receptacle small, flat, 

 with a single series of distinct or united chaff between the ray- 

 •end disk-flowers, Disk -flowers funnelform, 5-toothed, their style- 

 branches with long filiform hirsute appendages. Achenes some- 

 what hairy: those of the ray obovoid-triangular, without pappus : 

 of the disk quadrangular, tapering to the base, infertile, with a 

 pappus of 5-10 chaffy and mostly awned scales. 



C. trnncata DC. 1. c. Hemizoina truncata Gray. Very smooth and 

 glabrous : stems 1-2 feet high, simple or spa ing'y branched adove : leaves 

 linear, 1-3 inches long, the lower ones opposite : heads campanulate ; 4 or5 

 lines high: bracts of the involucre ovate-oblong, boat-shaped: ray-flowers 

 5-8, 3 lobed, the middle lobe smallest: chaff of the receptacle 7-9, lightly 

 united at the top into a truncate cup, at length separable: disk- flowers 10- 

 20, with a pappus of 7-10 oblong and somewhat erose fimbriate pointless 

 palese much shorter ihan the achene, s. metimes obsolete. On dry plains, 

 southern Oregon to California. 



C. multiglaiidulosa DC. 1. c. Stem simple or diffusely much branch- 

 ed, 1-2 feet high, strigose -hirsute: leaves mostly scattered, linear, mostly 

 with revolute margins, hirsutely ciliate; sessile: heads numerous, terminal 

 on short lateral branchlets, campanulate, 4 lines high: bracts of the invo- 

 lucre linear, bristly-ciliate, with numerous tack-shaped glands on their 



