Part 1, 1914] CARDUACEAE : HELENIEAE 29 



20. CROCKERIA Greene; A. Gray, Syn. Fl. N. Am. l^: 445. 1884. 



Annual glabrous caulescent herbs. Leaves opposite, sessile, linear. Heads radiate, 

 peduncled. Involucre hemispheric; bracts in a single series, broad, united three-fourths their 

 length into a cup. Ray-flowers ligulate, pistillate and fertile; ligules yellow. Disk-flowers 

 many, hermaphrodite and fertile; corolla-tube slender, longer than the obconic throat. 

 Achenes flat, hispidulous on the callous margins. Pappus wanting. 



Type species, Crockeria chrysanlha Greene. 



1. Crockeria chrysantha Greene; A. Gray, Syn. Fl. N. Am. l^: 445. 



1884. 



Lasthenia chrysantha Greene, Man. Bay Reg. 204. 1894. 



A glabrous annual; stem simple, 1-2 dm. high; leaves opposite, linear, 3-6 cm. long, 2-3 



mm. wide, the lower connate-sheathing at the base; peduncles 3-8 cm. long; involucre 



hemispheric, glabrous, 5-6 mm. high, about 10 mm. broad; lobes triangular; ray-flowers 



12-15; ligules about 5 mm. long, yellow; tube of the disk-corollas slender, 1.5 mm. long, 



glandular-puberulent; throat obconic, fully 1 mm. long; achenes obovate, 2 mm. long. 



Type locality: Valley of the San Joaquin, California 

 Distribution: Lowlands of central California. 



Subtribe 4. AMAURIANAE. Heads radiate. Bracts linear and ap- 

 pressed, rounded on the back and double-ribbed in the manner of Perityle. 

 Ray-flowers pistillate; corolla deciduous, fertile, ligulate or in Microspermum 

 with an irregular, 5-cleft, oblique, funnelform limb. Disk-flowers with a slender 

 glandular tube and from campanulate to trumpet-shaped throat. Pappus 

 when present partly consisting of awns as in the preceding subtribe, but 

 achenes 4-angled, not strongly flattened. 



Marginal pistillate flowers if present with linear 3-cleft ligules. 



Pappus wanting, represented by a callous crown ; perennials, suffruticose 



at the base. 21. Amauria. 



Pappus present. 



Pappus of 4 squamellae and 4 alternating awns; shrubs. 22. Eutetras. 



Pappus of narrow bristle-like squamellae; annual herbs. ■ 23. Oxypappus. 



Marginal pistillate flowers with an irregularly 5-cleft oblique limb. 24. MicrospERMum. 



Marginal pistillate flowers short-tubular; pappus-squamellae united into a 

 crown. {Thymopsis in the Tribe Millerieae.) 



21. AMAURIA Benth. Bot. Voy. Sulph. 31. 1844. 



Low glandular-pubescent perennials, suffruticose at the base. Leaves petioled, the lower 

 opposite, the upper alternate. Heads few, corymbose, radiate. Involucre hemispheric; 

 bracts of the same lengths in two series, somewhat boat-shaped below and partly surrounding 

 the achenes. Receptacle alveolate, but not chaffy. Ray-flowers ligulate, pistillate; style- 

 branches smooth. Disk-flowers many, 4 mm. long, hermaphrodite; style-branches hispid, 

 subulate or obtuse; anthers not caudate. Achenes linear, 4-angled, somewhat flattened, 

 the angles 2 and 2 closer together. Pappus of a short callous crown. 



Type species, Amauria rotundifolia Benth. 



Achenes pubescent on the angles only; involucres 6-7 mm. high and 12mm. broad. 1. A. rotundifolia. 

 Achenes pubescent on the faces as well as the angles; involucres 5 mm. high and 



about 7-9 mm. broad. 2. A. Brandegeana. 



1. Amauria rotundifolia Benth. Bot. Voy. Sulph. 31. 1844. 



Perityle Filchii Torr. Pacif. R. R. Rep. 4: 100. 1857. 

 Laphamia pfninsidaris Greene, Bull. Calif. Acad. 1: 8. 1884. 

 Perityle rotundifolia Brand. Zee 4: 210. 1893. 



A perennial with woody caudex; stem densely glandular-pubescent, 1-2 dm. high; lower 



leaves opposite, the upper alternate; petioles short, about 1 cm. long; blades thick, ovate to 



orbicular, subcordate at the base, doubly dentate or slightly lobed, 3-nerved, glandular on 



