6S NORTH AMERICAN FLORA [Volume; 34 



linear, densely floeeose; corollas yellow, the central ones 6 mm. long, pubescent, the marginal 

 ones with palmately dilated limb, 4-5 mm. long; achenes 5 mm. long, hirsute; pappus of 

 the disk-achenes of 4 lanceolate squamellae nearly as long as the corolla, and 1-4 smaller 

 intermediate ones, which are 1-2 mm. long and obtuse; squamellae of the marginal achenes 

 usually all short and blunt. 



Type locality: [In the Sacramento Valley] California. 

 Distribution: Sacramento Basin. 



7. Chaenactis tanacetifolia A. Gray, Proc. Am. Acad. 6: 545. 1865. 



A low annual; stem 1 dm. high or less, branched at the base, loosely floeeose; branches 

 usualh r monocephalous ; leaves mostly basal, bipinnatifid, 3-5 cm. long, with short oblong 

 divisions; involucre sparingly floeeose, 7 mm. high, 8-10 mm. broad; corollas yellow, the 

 central ones 6 mm. long, puberulent, the marginal with a slightly dilated limb which is 3 

 mm. long; achenes 4 mm. long, sparingly hirsute; squamellae of the disk-flowers obtuse, about 

 3 mm. long, often with outer short obtuse squamellae; squamellae of the marginal flowers all 

 short, about 1 mm. long. 



Type locality: Near Clear Lake, Lake County, California. 

 Distribution: Lake County, California. 



8. Chaenactis tenuifolia Nutt. Trans. Am. Phil. Soc. II. 7: 375. 



1841. 



Chaenactis filifolia Harv. & Gray; A. Gray, Mem. Am. Acad. II. 4: 98. 1849. 

 Chaenactis glabriuscula tenuifolia H. M. Hall, Univ. Calif. Publ. Bot. 3: 191. 1907. 



A slender winter annual; stem simple up to the inflorescence, sparingly floeeose; leaves 

 4-6 cm. long, bipinnatifid into linear-filiform divisions; peduncles 1-5 cm. long; involucre 

 5-6 mm. high, 8-10 mm. broad; bracts 20-25, narrowly linear, acute, rather thick, floeeose 

 as well as glandular-granulif erous ; corollas yellow, the central ones about 5 mm. long, those 

 of the margin somewhat enlarged, with obliquely funnelform, 5-lobed limb; squamellae lance- 

 olate to ovate, acute or obtuse, those of the central flowers 3-4 mm. long, those of the marginal 

 ones much shorter (C. filifolia is a slender form with shorter pappus). 



Type locality: St. Diego, California. 



Distribution: Southern California and Lower California. 



9. Chaenactis aurea Greene, sp. nov. 



An annual; stem branched at the base, with ascending branches, about 2 dm. high, more 

 or less floeeose and purple-tinged ; leaves alternate, 3-5 cm. long, pinnatifid with linear, entire 

 or cleft divisions, usually decidedly floeeose; heads at the ends of branches 3-6 cm. long; 

 involucre broadly turbinate, about 8 mm. high and 10 mm. broad; corollas golden-yellow, 

 5 mm. long, the marginal ones only slightly enlarged and oblique; achenes 4.5 mm. long, 

 appressed-hirsute ; squamellae lanceolate, unequal, 3-5 mm. long. 



Type collected on Wilson's Peak, California, 1901, Le Roy Abrams 1890 (herb. E. L. Greene). 

 Distribution: Southern California. 



10. Chaenactis gracilenta Greene, Fl. Franc. 447. 1897. 



Chaenactis helerocarpha A. Gray, Syn. Fl N. Am. I 2 : 339, mainly, 1884. 

 Chaenactis helerocarpha curia A. Gray, Syn. Fl. N. Am. ed. 2. I 2 : 452. 1886. 



Erect slender annual; stem 1-3 dm. high, branched, more or less flexuose, sparingly 

 floeeose when young; leaves pinnate or bipinnate with short linear divisions, sparingly floeeose; 

 peduncles 2-5 dm. long; involucre about 7 mm. high, 8-10 mm. broad; corollas yellow, the 

 central ones 5 mm. long, those of the margin with moderately ampliate, obliquely funnelform 

 limb; achenes 4-5 mm. long, sparingly hirsute; squamellae unequal, oblong or obovate, obtuse 

 and erose, less than one half as long as the corolla. 



Type locality: Napa Valley, California. 

 Distribution: California. 





