w4 CONTRIBUTIONS TO WESTERN BOTANY 
Perezia megacephala has the oblung scales acute below but 
yot the inner ones, imbricated. Akenes smooth, deeply 8-ribbed 
und with no warts between, lem long, slightly contracted at the 
ends with no disk at tip, 
Perezia Arizonica and Wrightii have lacerate and ovate to 
oblong scales slightly ribbed and scabrous akenes with wide disk 
uud white pappus. 
Perezia oxylepis has lanceolate to linear-acuminate, not lacerate 
scales and beaked, scabrous. slightly ribbed akenes with a broad 
tlisk and traces of a crown, 
’erezia hebeclada has scabrous, slightly lacerate scales lance- 
late to linear-acuminate and acerose. Akenes slightly beaked, 
yibbed and scabrons, 
Perezia foliosa has lanceolate, long-acuminate and rather acer- 
ose scales, smooth and not lacerate. Akenes slightly ribbed, sca- 
Perezia nana has pubernlent, striate, ovate to acuminate-lan- 
coolate, lacerate scales, Pappus inclined to be tawny,and akenes 
very-shortly pubescent and slightly ribbed, short-beaked and with 
broad disk as if a crown. 
: Perezia runcinata has Jinear-acuminate lacerate scales, sca- 
rous, long-beaked akenes abont 5-angled and evidently related to 
nana. Root tuberous, 
‘ Oe 9 ‘ 
noir T Hietoay has ares to lanceolate, seabrons,, not lucerate 
; : enes very short,truncat é 
Parca oh y ‘ ate not beaked, scabrous angled. 
Perezia turbinata reverses the usual order by having the outer 
7 paren ds pi acuminate, nearly smooth, not la- 
verate- Akenes long-beaked, angled. sc: wi fas isk- 
Pappus rather tawny. ee rnd eh 
Perezi ta n. sp. Orendain Jalisco, Nov. 26 1930. 
-3 ft. high, érect and strict, pvramidally 
Leaves thick, nar- 
: 1 a 
strongly 7-ne wee ee 2mm. long. round, very 
ore nerved and-with shining low warts between the ribs) 
