150 TREES AND SHRUBS 



tips; ray-flowers unifonniy wanting; disk-flowers 5 to 30; style 

 branches subulate or filiform, usually long-exse-rted; achenes narrow, 

 terete or slightly angled; pubescent; pappus copious, soft, commonly 

 dull white. 



Achenes glabrous. 

 Stems, leaves, and involucres more or less 



floccose. 1- C. Uigclovii. 



Plants without floccose pubescence. - C. linifoliua. 



Achenes pubescent; plants tomentose at least 

 on the young branches. 

 Branches and leaves permanently white 



tomentose. 3. C. latisquamea. 



Branches and leaves becoming glabrous. 

 Bracts glabrous; lobes of the corolla 

 spreading in age; plants much 



branched. . *■ C. graveoleus. 



Bracts villous-ciliate; lobes of the corol- 

 la erect; plant sparingly branched. 5. C. confinis. 



5. CHRYSOMA Nutt. 



Shrubby caulescent herbs, with somewhat glutinous foliage; 

 leaves alternate, blades fleshy, leathery, narrow, conspicuously pit- 

 ted, mostly 1-nerved; heads radiate, numerous; involucres narrow, 

 few-flowered, bracts in few series; receptacle pitted: ray-flowers 

 1 to 3, pistillate; disk-flowers mostly perfect; corollas yellow, tube 

 scarcely dilated above; anthers obtuse at base; stigmas flattened, 

 with lanceolate appendages; achenes pubescent; pappus of 1 to 2 

 series of numerous brownish hair-like bristles. 



This would be well worth cultivation but our efforts to trans- 

 plant it have always failed. 



1. C. laricifolia. 



6. BERTHELLOTIA DC. Arrow-wood. Cachinilla 



Annual or perennial caulescent herbs, or shrubs; leaves alter- 

 nate, blades usually toothed, often prominently nerved, petioled or 

 the upper sessile or clasping; heads discoid, commonly in cluster-like 

 cymes; involucres turbinate, hemispheric or campanulate. with pis- 

 tillate and perfect flowers, bracts moid, in few series: receptacle 

 flat, naked; pistillate flowers marginal, -fruit-producing: perfect 

 flowers central, mostly not fruit-producing: anthers sagittate, the 

 auricles tailed: stigmas united or distinct; achenes 4 to 5-angled; 



pappus a single series of scabrous hair-like bristles. 



1. B. borealis. 



