436 COMPOSlTiE. 



least gummy, quite glabrous: rays *4 in. long: palese of the pappus 

 broadly ovate, abruptly ending in a long slender awn. — Very common 

 along rivers and streamlets at middle elevations in both Coast Range 

 and Sierra, especially northwards; forming by far the greater propor- 

 tion of the " Heleiiium Bigelovii " of the herbaria, but very distinct from 

 the type of that species, both in character, and as to distribution. June. 

 —Sept. 



5. H. puberiilniii, O. Ktze, 1. c; DO. Prodr. v. 667 (1836), under 

 Helenium. Minutely cinereous pubescent, 2 — 4 ft. high, with slender 

 widely spreading monocephalous branches: leaves lanceolate, entire, all 

 but the radical strongly decurrent: involucre and refie^ced rays very 

 short and inconspicuous: globose disk of red-brown flowers }^ in. thick: 

 palesB of pappus ovate, short-awned. — Banks of streams, and in other 

 moist places, on the plains, and along the seaboard. July — Dec. 



73. LASTHENIA, Cassini. Mostly annuals and low, glabrous, 

 slightly succulent. Leaves opposite. Heads middle-sized, on slender 

 peduncles. Receptacle conical to subulate, muricate witli projecting 

 points on which the achenes are inserted. Involucres hemispherical, 

 their uniserial bracts usually united and forming a toothed cup. Rays 

 oval or oblong. Disk-corollas with slender tube and campanulate 5- 

 toothed limb. Achenes linear, subclavate. or linear-cuneate, more or 

 less flattened or angled, naked at summit, mostly destitute of pappus. 



* Achenes wilh a paleaceous pappus. 



1. L. glaberriiiia, DO. Prodr. v. 664 (1836). Stems weak, decum- 

 bent, 1 ft. long or less, very glabrous: leaves linear, entire: heads nod- 

 ding in bud: involucre about 15-toothed: rays very short; all the 

 corollas shorter than their broadly linear pubescent achenes: pappus of 

 5 — 10 firm chaflFy scales, 2 or 3 of them subulate-pointed or short-awned, 

 the others not so. — Subaquatic herb of shallow winter pools on low 

 plains or in depressions among the hills; not very common. — May, June. 



* * Pappus irJiully wautiiig. 



2. L. glabrata, DC. in Lindl. Bot. Reg. t. 1780 (183.5). Stout, spar- 

 ingly branching, 1—2 ft. high, peduncles few, elongated, erect: leaves, at 

 least the upper pairs, ovate-lanceolate, coarsely but irregularly toothed, 

 conspicuously connate at the dilated base and forming an open. cup 

 rather than sheath : heads very large, 1 in. wide : achenes dark, smooth. 

 — Borders of salt marshes only; not common. June. 



3. L. Californica, DO. in Lindl. 1. c, also at t. 1823. More slender, 



