Part 1, 1914] 



CARDUACEAE : HELENIEAE 



13 



Involucre about 6 mm. high and 7-8 mm. broad; achenes 

 oblong. 

 Leaf-blades more or less deeply lobed. 

 Leaf-blades merely dentate. 

 Involucre about 4 mm. high and 5-6 mm. broad; achenes oval. 

 Bristles 2, shorter than the achene. 



Callous margin of the achenes broad, about half as broad as the 



body. 

 Callous margin of the achenes narrow. 



Involucre 6-8 mm. high, 10-11 mm. broad; achenes ob- 



lanceolate-cuneate. 

 Involucre 3-5 mm. high, 4—7 mm. broad; achenes oblong. 

 Leaves more or less lobed; ligules 2 mm. long, with short 



rounded teeth. 

 Leaves merely dentate ; ligules 4 mm. long, deeply toothed. 

 Margins of the achenes not callous; ligules white except in the first 

 species; awn solitary or wanting. {Emory anae.) 

 Ligules bright-yellow; plant low. 

 Ligules white or cream -colored. 



Leaves not deeply divided, merely lobed. 



Achenes 2 mm. long, short-hispid on the margins. 

 Achenes 3 mm. long, long-hirsute on the margins. 

 Leaves deeply divided, more than halfway to the midrib. 

 Perennials, or if annuals with thick fleshy leaves. (Crassifoliae.) 



Low decumbent plant; involucre 5 mm. high and 6-7 mm. broad; 



awns 2. 

 Tall erect plants; involucre 6-7 mm. high, 10-12 mm. broad; awn 1. 

 Densely arachnoid even as to the involucre; awn equaling the 



achene. 

 Glandular-puberulent plant, arachnoid only at the base; awn 

 shorter than the achene. 

 Suffruticose grayish-puberulent perennials, slightly if at all glandular; stems 

 woody at least at the base. (GalinsogBopsis.) 

 Leaves not deeply dissected. 



Heads radiate; achenes not keeled on the faces. 

 Leaf-blades 1-3 cm. long. 

 Leaf-blades acuminate. 

 Leaf -blades acute. 



Leaf -blades dentate; achenes pubescent. 

 Leaves not punctate beneath. 

 Leaves decidedly impressed -punctate beneath. 

 Leaf -blades entire or nearly so; achenes glabrous. 

 Leaf -blades less than 1 cm. long. 

 Heads discoid; achenes slightly keeled on the faces. 

 Leaves deeply dissected. 



Ultimate lobes of the leaves cuneate ; involucre 8-10 mm. high, 10-12 



mm. broad. 

 Ultimate lobes of the leaves linear or oblanceolate ; involucre 4-5 mm. 

 high, 6-8 mm. broad. 

 Leaf -blades 2—3 cm. long; plant slender, decumbent. 



Leaves not impressed -punctate; awn minute, much shorter 



than the achene. 

 Leaves impressed-punctate ; awns about as long as the achene. 

 Leaf -blades 0.5-2.5 cm. long; plant erect, low. 



1. P. calif ornica. 



2. P. deltoidea. 



3. P. plumigera. 



4. P. marginata. 



5. P. cuneata. 



6. P. microglossa. 



7. P. urticifolia. 



8. P. aurea. 



9. P. Grayi. 



10. P. Emory i. 



1 1. P. Greenei. 



12. P. socorrensis. 



13. P. crassifolia. 



14. P. robusta. 



15. P. saxosa. 



16. P. spilanthoides. 



17. P. ciliata. 



18. P. Rosei. 



19. P. Hofmeisteria. 



20. P. jaliscana. 



21. P. Vaseyi. 



22. P. lineariloba. 



23. P. gracilis. 



24. P. coronopifolia. 



1. Perityle californica Benth. Bot. Voy. Sulph. 23. 1844. 



A divaricately branched viscid-pubescent annual; stem 1-2 dm. high; leaves petioled, 



opposite or alternate; petioles 2-4 cm. long; leaf-blades rhombic-ovate or the upper suborbicular 



in outline, triple-ribbed, cuneate or truncate at the base, sparingly pubescent on both sides, 



somewhat lobed and coarsely dentate, the lower 3-5 cm. long; peduncles axillary, 1-3 cm. long; 



involucre hemispheric, 7-8 mm. broad; bracts oblanceolate, striate, hispid, the inner ones with 



scarious margins; ray-flowers 12-15; ligules light-yellow, broadly oblong, 3-toothed, 3 mm. long; 



disk-flowers numerous, yellow, glandular-puberulent; achenes barely 2 mm. long, oblong, 



hirsute on the callous margins, pubescent on the faces; pappus of a crown of erose lanceolate 



squamellae one fourth as long as the achene and a single awn barbellate throughout. 



Type; locality: Bay of Magdalena, Lower California. 



Distribution: Lower California. 



Illustrations: Benth. Bot. Voy. Sulph. pi. 15; Bot. Gaz. 15: pi. 13, f. 3. 



2. Perityle deltoidea S. Wats. Proc. Am. Acad. 24: 57. 1889. 

 A low annual; stem 1-3 dm. high, diffusely branched, glandular-puberulent; leaves petioled, 

 opposite or the upper alternate; petioles 1-3 cm. long; blades ovate-deltoid or subcordate, 



