420 COMPOS IT JS. 



flowered: pappus of ray- and disk-acbenes alike, short and spreading, 

 less plumose than in the preceding, only a fifth as long as the achene. — 

 Habitat of the other species. 



61. CALYCADENIA DeCandolle. Eigid strict virgate more or less 

 hispid annuals. Lowest leaves opposite, the others alternate, all nar- 

 rowly linear, entire, revolute; those of the axillary fascicles and about 

 the heads subulate, but obtuse, commonly ending in a large saucer- 

 shaped gland. Receptacle small, flat, the chaff herbaceous and only 

 encircling the disk flowers. Rays 1 — 5, white or yellow, vespertine, 

 palmately 3-lobed or -parted; the head as a whole narrow and small. 

 Ray-achenes obovoid-triangular, the terminal areola low, nearly central. 

 Disk-achenes turbinate-quadrangular, the outer fertile, all bearing a 

 conspicuous chatfy pappus (except in n. 2). 



* Yellow -flowered species. 



1. C. truiicata, DC. Prodr. v. 695 (1836); Gray, Proc. Am. Acad. ix. 

 192 (1874), under Hemizonia. Slender, 1—2 ft. high, glabrous, or some 

 of the lower leaves sparsely hispid; herbage keenly benzine-scented, 

 though rigid and dry: heads sessile and scattered along the virgate 

 branches: short uppermost leaves and bracts truncate by a large sessile 

 flattish gland: fl. yellow; rays 5 (rarely more); disk-fl. 10—24; receptacle- 

 chaff" distinct, or nearly so, truncate: pappus of disk-achenes of 7 — 10 

 oblong fimbriate-toothed pointless palese. — Foothills of Coast Range 

 and Sierra, from Marin and Amador counties northward, in dry open 

 ground. July— Oct. 



2. C. scabrella. Hemizonia scabrella. Drew, Bull. Torr. Club. ix. 

 1,51 (1889). More slender than the preceding, with loose and spreading, 

 not at all virgate, mode of branching: leaves minixtely scabrous: rays 

 3 — 5: chaff" of receptacles not united: achenes rugose, glabroiis, the 

 abortive ones of the disk, glabroiis and devoid of pappus. — Humboldt 

 and Trinity counties to southern Oregon. The northern analogue of C. 

 truncata, and wholly distinct, the heads solitary at the ends of the 

 slender branchlets. 



3. C. mollis, Gray, Proc. Am. Acad. vii. 360 (1868); 1. c. 191 (1874), 

 under Hemizonia. Stem only puberulent, 1 — 2 ft. high: leaves cinere- 

 ously puberulent, those of the fascicles and near the heads like the 

 involucral bracts tipped with a short-stalked dark gland: ray-corollas 

 3 — 5, 3-parted: chaff of receptacle forming a 6— 8-toothed cup: ray- 

 achenes obpyramidal, glabrous: disk-flowers 5 — 10, with pappus of 5 or 

 6 subulate awned palese nearly twice the length of the achenes, and one 



