174 CALIFORNIA ACADEMY OF SCIENCES. 



the inner rows narrow, keeled, only half enclosing their 

 akenes, which are a third shorter than those of the ray: disk 

 akenes linear, 4 angled, somewhat compressed, 2-4 mm. long, 

 somewhat pubescent especially on the alternate angles, 

 sometimes covered with a grayish scurf; in the same head 

 either naked or with a lacerate crown prolonged at one or 

 two of the angles into stout hispid awns continuous with 

 them. — Purisima. 



ALVORDIA. 



Heads small, sessile, flattened, glomerate, heterogamous: 

 flowers of the ray neutral, of the disk hermaphrodite. Invol- 

 ucre narrow, contracted above; bracts few-seriate, exterior 

 shorter, those of the receptacle embracing the akenes. 

 Anthers minutely auriculate at base. Style branches 

 linear-cuneate with short acute appendages. Akenes ob- 

 long, quadrangular, truncate at apex : pappus of 2-4 hispid- 

 paleaceous awns, and twice or thrice as many intermediate, 

 similar and smaller ones. Suffrutescent herb with opposite 

 nearly entire leaves, and pedunculate glomerules at the ends 

 of the branches and from the upper axils. 



Named for William Alvord of San Francisco, in recogni- 

 tion of his well known unceasing interest in and efforts for 

 the furtherance of botanical knowledge, especially on the 

 Pacific Coast. 



Alvordia glomerata. Perennial suflrutescent, 3 or 4 feet 

 high, scabrous: branches slender, spreading: leaves stri- 

 gose pubescent, remote, ovate-lanceolate, entire or sparingly 

 dentate, 3-nerved, 1-2 inches in length on petioles less 

 than half as long: heads 10-12 mm. long, 3 mm. wide, ses- 

 sile, closely glomerate at the ends of peduncles 1-2 inches 

 long, each branch usually ending in three glomerules, one 

 terminal and two arising from the axils of the upper pair of 

 leaves: involucres narrow, flattened, contracted above, con- 

 cave on the inner face; bracts about 6, the exterior shorter, 

 navicular, ciliate, thickened at base, the inner longer, obtuse, 



