180 University of California Publications in Botany. [VOL. 3 



Common in the Lower Sonoran Zone throughout the Colorado 

 Desert: less common on the Mohave Desert, where it ranges as 

 far north as Coso Mts., ace. to Coville; east into Arizona; south 

 into Mexico. 



70. ERIOPHYLLUM Lag. 



Annual and perennial herbs or suffruticose plants. Herbage 

 white-woolly, at least when young. Leaves mainly entire, or 

 variously toothed, divided, or incised. Involucre oblong to 

 hemispheric, its bracts distinctly rigid and permanently erect, 

 concave and disposed to enfold the mature outer achenes. Re- 

 ceptacle flat or convex. Rays 4 to 13 or 15, broad, rarely lack- 

 ing. Tube of disk-corollas commonly glandular and hairy. Style- 

 branches from truncate to conical or subulate. Achenes linear 

 or linear-clavate. Pappus various, sometimes lacking. 

 A. Annuals: low (under 2 dm.) and diffuse. 

 Heads mostly sessile: receptacle flat or nearly so. 



Kays 2 mm. long 1. E. multicaule. 



Kays none 2. E. Pringlei. 



Heads pedunculate: receptacle convex or conical: rays conspicuous. 

 Achenes linear: leaves entire or toothed. 



Pappus-paleae very unequal; about 5 short obtuse paleae alternat- 

 ing with as many longer awned ones 3. E. lanosum. 



Pappus-paleae equal or wanting. 



Anther-tips linear-subulate: tomentum copious, persistent 



4. E. Wallacei. 



Anther-tips obtuse or merely acute: tomentum less copious, 



deciduous 5. E. ambiguum. 



Achenes clavate: leaves mostly pinnately parted 6. E. Heermanni. 



B. Biennials and perennials: taller (3 dm. or more) and erect. 

 Heads small, terminally clustered: leaves mainly divided or parted. 

 Rays 6 to 10: stems mostly over 6 dm. high: maritime species. 



Leaves green above: pappus-paleae 8 to 12 7. E. staechadifolium. 



Leaves white-tomentose on both sides: pappus-paleae 4 to 6 



8. E. Nevinii. 



Rays 4 or 5, or none: stems mostly under 6 dm. high 



9. E. confertiflorum. 



Heads large, solitary on long peduncles: leaves mainly entire: var. obovatum 

 of 10. E. lanatum. 



1. E. multicaule (DC.) Gray, Proc. Am. Acad. xix. 24 (1883). 

 Actinolepis multicaulis DC., Prodr. v. 656 (1836) ; Hook., Ic. 

 PI. t. 325 (1841) ; Torr., Bot. Hex. Bound. 96, t. 33 (1859). 



