18 PROCEEDINGS OP THE AMERICAN ACADEMY. 



"Var. latifolia, Rose. Leaves somewhat broader, oblong. — 

 Contrib. U. S. Nat. Herb. i. 102. — Alamos, Palmer^ no. 352. 



§ 5. Distinctly annual herb with showy flowers : disk and rays 

 concolorous, yellow, red, or purple, or if discolorous the disk-flowers 

 yellow or greenish and the rays red or purple : leaves ovate, lanceo- 

 late, or elliptic. 



» Leaves sessile or nearly so, entire. 



•t- Achenes of the disk-flowers sliort and broad, obovate, 2 to 2\ lines in 

 length : stems hirsute with spreading hairs. 



12. Z. angustifolia, HBK. Branching, H to 2 feet high: 

 leaves lance-linear from a sessile ovate base : disk very convex, 

 orange-yellow from the abundant acute exserted chaff (orange-yellow 

 minutely tipped with purple at the very summit); disk-flowers at first 

 orange and becoming darker with age : rays paler yellow\ — Nov. 

 Gen. «fe Spec. iv. 251 ; DC. Prodr. v. 536. — Originally collected in 

 the neighborhood of Guanajuato by Humholdt Sf Bonpland, and de- 

 scribed as having leaves " scarcely 2 lines broad." Our only authentic 

 specimen of this species is one of Meridez sent by De Candolle to 

 Dr. Gray and mentioned in the Prodromus as of this species. From 

 other details of the description we cannot doubt that De Candolle was 

 right in referring this plant to Kunth's species, although in it and in 

 all the following specimens attributed to this species the leaves are con- 

 siderably broader than originally described, varying from 3 to 8 lines 

 in breadth. Evidently identical with Mendez' plant are specimens 

 collected at Morelia, Ghieshreglit ; no. 369 {"iZ. Ghieshreghtii , Verlot, 

 Rev. Hort. 1862, 368; Vilmorin, Fl. PI. Terre, 971,^.2', Mexicana, 

 Hort. fide Vilmorin, 1. c), and near La Barca, Jalisco, Pringle, no. 

 3866 ; also cultivated plants from the Harvard Botanic Garden, dated 

 1861 and 1865. From this species, notwithstanding its still broader 

 leaves, we cannot confidently separate the horticultural Z. Haageana, 

 Regel, Gartenfl. x. 355, ex char. 



1 3. Z. elegans, Jacq. Erect : stems less branched : leaves 

 broader, ovate or elliptic, closely sessile and clasping, inch or so in 

 breadth : disk-flowers yellow or orange, scarcely or not at all exceeded 

 by the purplish tipped chaff; rays numerous, purple or lilac. — Coll. & 

 Icon. PI. Rar. iii. t. 589 ; Sims, Bot. Mag. t. 527. — South Mexico, 

 Ziticuaro, Hartweg ; mountains of Tixtla near Cuernavaca, Berlandier, 

 no. 975 ; also without locality, GIdesbreght, no. 306. Extensively culti- 

 vated in various countries. 



