ROBINSON AND GREENMAN. — GENUS ZALUZANIA. 531 
ber in herb. Gray. Notwithstanding the general similarity subsisting 
between this species and the preceding, the difference in the size and 
form of the ultimate leaf-segments is sufficiently marked to warrant at 
least varietal distinction, and in the absence of any evidence of inter- 
gradation it seems best to maintain the species as proposed by Schultz. 
Schaffner’s no. 845 from San Luis Potosi appears to be a glabrescent 
form of this species. 
3. 4. anthemidifolia. Nearly glabrous except on the younger 
parts: stems decumbent: radical leaves unknown, the cauline numerous 
(12 to 22, the lower successively caducous), ovate and acute in general 
contour, 2—3-pinnate; ultimate segments obtuse or obiusish: peduncles 
2 to 5 em. long (shorter than in the related species); involucral scales 
puberulent, obtuse or obtusish. — Wet sandy river banks, Guadalajara, 
Jalisco, Pringle, 23 September, 1891, no. 5156. Type in herb. Gray. 
With heads and habit of Z. globosa, but a smooth stem and numerous 
cauline leaves of quite different contour and lobing. 
Subg. 2. Ferprnanpa. Plants of drier habitat: disk 7 to 12 mm. in 
diameter: rays 5 to 12 or none. — Ferdinanda, Lag. Elench. 31. 
* Rays present. 
+ Leaves ginuate-lobed. 
+ Annual or eee pape pale with copious canescent or sordid pubescence: 
about 8, short, 6 to 8 mm. in length. 
if 4. Z. Trinopa, Pers. Stems 3 to 7 dm. high, branched above, canes- 
cent-tomentulose to hirsutulous or granular: leaves sinuately bipinnatifid 
With angular segments: heads rather numerous in terminal corym 
Syn. ii. 473; DC. Prodr. y. 553; Hemsl. 1. ¢. ii. 160, iv. 55; Wats 
Proc. Am. Acad. xviii. 105. Z. trilobata, Hoffmgg. Verz. Pfl. Nachtr. 
ii. 231, ace. to Hook. f. & Jacks. Ind. Kew. ii. 1245. Anthemis sinu- 
ata, Llav. & Lex. Nov. Veg. Descr. i. 30. A. triloba, Ort. Dec. 72. 
—A distinct and readily recognized species, sci common from 
Coahuila, throughout Central Mexico to Orizaba 
++ ++ Perennial, green and smoothish; rays about 10, 2 cm. or more in length. 
5. Z. Grayana. Suffruticose, 6 to 8 dm. high, from a branched 
lignescent stock surmounting a thick woody root: leaves ovate, petiolate, 
3-lobed ; lobes rather broad, oe toothed : involucral scales linear, 
