16 PROCEEDINGS OF THE AMERICAN ACADEMY. 
§ 2. Erect or procumbent herbs, sometimes a little woody at the base ; 
stems and branches loosely spreading ; leaves linear, lance-linear, or ellip- 
tic-oblong: rays rather short, suborbicular or quadrate to oblong, 2 to 6 
lines in length, white or sulphur yellow. 
* Achenes with interrupted callous margins and somewhat tufted ciliation: 
slender erect annual with small heads and very pale or bright white rays. 
6. Z. bicolor, Hemsl. Becoming a foot or so in height: leaves 
linear to lance-oblong, an inch to inch and half long, 1 to 4 lines broad, 
obtuse. —Biol. Cent.-Am. Bot. ii. 153, as to syn., but not as to specimens 
cited, except that of Mendez. Z. maritima, Gray, Proc. Am. Acad. xxii. 
423,in part. Mendezia bicolor, DC. Prodr. y. 533; Deless. Icon. iv. t. 29. 
— West of Guanajuato, Mendez ; San Luis Potosi, Schaffner, no. 337; 
Jalisco, at Tequila, Palmer, no. 355, and on slopes of cafions near Guada- 
lajara, Pringle, no. 2313. The last two distributed as Z. maritima, from 
which this erect white-rayed plant of the inland is amply distinct. 
* * Achenes evenly margined and regularly ciliated ; rays yellow or orange. 
7. Z. Greggii. Slender pubescent herb, becoming scabrous, erect 
or decumbent merely at the base: leaves linear or nearly so, 1-3-nerved, 
sessile : heads slender-peduncled, terminating the spreading nearly naked 
branches, these bearing mostly only a single pair of linear leaves: rays 
varying from very short-oblong to half inch in length: disk-flowers 
orange ; ray-flowers pale yellow; ray-achenes about a line in length : 
disk-achenes bearing a single slender awn. — Z. bicolor, Hemsl. 1. eee 
to plants of Coulter and of Seemann, but not as to syn. Z. maritima, 
Gray, Proc. Am. Acad. xxii. 423, as to narrow-leaved form, not HBE- 
— Mexico, without locality, Gregg, 1848-1849, no. 1082; also Baites ; 
W. Mexico, Seemann ; none of these specimens show the base perfectly ’ 
but a plant apparently identical, collected by &. H. Lamb on pest - 
Zopelote, Tepic, 9 February, 1895, no. 555, has a thickish perennial in 
8. Z. littoralis. Procumbent spreading herb, probably of biennl 
or perennial duration: stems leafy, branched, striate, puberulent: eit 
elliptic-oblong or elliptic-lanceolate, obtuse or obtusish at both ends, 3 « 
obscurely 5)-nerved and reticulated, green on both sides, 4 to 10 yer 
long, a third to half as broad: heads scarcely peduncled, borne at pet 
ends of leafy branches: rays orbicular or nearly so, pale yellow, sti 
and greenish toward the ends beneath: disk-flowers bright orange 
colored; chaff oblong, very obtuse or truncate: achenes with eRe” 
narrow cartilaginous margin, ciliated: pappus of a single awn with , 
without a shorter second one: achenes of the ray-flowers about 15 eet 
long, tuberculate. — Collected at Mazatlan by 7h. Coulter, and redis 
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