Part 1, 1914] CARDUACEAE : HELENIEAE 67 



2. Chaenactis lacera Greene, Pittonia 1: 291. 1889. 



An annual, scurf y-canescent when young; stem 3-5 dm. high, branched, glandular- 

 puberulent in the inflorescence; leaves 5-10 cm. long, ovate-lanceolate in outline, hi- or tri- 

 pinnate into linear divaricate and flexuose segments ; heads corymbose; involucre hemispheric, 

 12-13 mm. high, 12-15 mm. broad; bracts 15-18, linear, acute or acuminate, glandular- 

 puberulent and viscid-hirsute; corollas all alike, white, 6 mm. long; achenes clavate-linear, 

 compressed, hispidulous and glandular-granuHferous; squamcllae 8-10, lanceolate, acute,, 

 lacerate. 



Type locality: Bay of San Bartolome, Lower California. 

 Distribution: Lower California. 



3. Chaenactis lanosa DC. Prodr. 5: 659. 1836. 



Chaenactis glabriuscula lanosa H. M. Hall, Univ. Calif. Publ. Bot. 3: 192. 1907. 



A winter annual; stem 2-3 dm. high, branched from the base, the first peduncles scapi- 



form, floccose, the branches sometimes branching above and bearing 2-3 peduncles; peduncles 



naked or with simple leaves, 5-20 cm. long, Ihickish, simply pinnatifid with narrowly linear 



divisions; involucre 8-10 mm. high, 12-20 mm. broad; bracts 20-25, linear, acutish, densely 



floccose; corollas yellow, pubescent, the central ones 6 mm. long, the marginal ones usually 



moderately ampliate, a little longer; achenes 5-6 mm. long; squamellae of the central flowers 



lanceolate, acute, nearly as long as the corollas, those of the margin scarcely half as long and 



obtuse. 



Type locality: California. 



Distribution: Central and southern California; lower California. 



4. Chaenactis glabriuscula DC. Prodr. 5: 659. 1836. 



Chaenactis glabriuscula megacephala A. Gray, in Terr. Pacif. R. R. Rep. 4: 104. 1857. 



A leafy annual; stem 1.5-5 dm. high, commonly branched above; branches ascending; 

 leaves once or twice pinnately divided into linear lobes or the upper entire, 5-10 cm. long, 

 thinly floccose, in age glabrate; peduncles 3-8 cm. long; involucre 8-10 mm. high, 10-15 

 mm. broad; bracts 15-18, broadly linear or oblong, obtuse, thinly floccose; corollas 

 yellow, pubescent, the central ones about 6 mm. long, the marginal with ampliate palmate 

 limb, 4—5 mm. long; achenes about 5 mm. long, hirsute; squamellae of the central flowers 

 linear-lanceolate, acute, nearly as long as the corollas, those of the marginal flowers usually 

 less than half as long and obtuse. 



Type locality: California. 



Distribution: Washington to southern California. 



5. Chaenactis denudata Null. Proc. Acad. Phila. 4: 21. 1848. 



A leafy winter annual; stem 3-4 dm. high, much-branched, sparingly floccose, soon 

 glabrous, decidedly glandular above; leaves 5-8 cm. long, once or twice pinnately divided into 

 linear divisions, sparingly floccose; peduncles 3-15 cm. long, decidedly glandular-hispid as 

 well as slightly floccose; involucre about 10 mm. high, 15-20 mm broad; bracts 25-50, 

 linear, obtuse, densely glandular-hispidulous; corollas yellow, the central ones 6 mm. long, 

 pubescent, the marginal ones with ampliate palmate limbs, 4-5 mm. long; achenes 5 mm. long, 

 sparingly hirsute; squamellae lanceolate, acute, nearly equaling the corollas, those of the 

 marginal flowers obtuse, only 1 or 2 mm. long. 



Type locality: Los Angeles, California. 

 Distribution: Southern California. 



6. Chaenactis heterocarpha A. Gray, Mem. Am. Acad. II. 4: 98. 



1849. 

 A rather simple annual; stem 1-2 dm. high, leafy throughout, with 1-3 heads, rather 

 densely floccose; leaves 5-8 cm. long, once or twice pinnatifid into linear segments, rather 

 densely floccose; peduncles 3-5 cm. long; involucre 10-12 mm. high, 12-18 mm. broad; bracts 



