CONTRIBUTIONS FROM THE GRAY HERBARIUM OF HARVARD 

 UXIVEKSITY, NEW SERIES. — NO. XXVIII. 



Presented by B. L. Robinson, February 10, 1904. Received February 27, 1904. 



I. — REVISION OF THE GENUS SABAZIA. 

 B. L. Robinson and J. M. Greenman. 



Sabazia is a small and exclusively American genus of the Helianthoideae. 

 It is chiefly Mexican in its distribution, although one of its species ranges 

 as far south as Ecuador. It is circumscribed here as by Bentham and 

 Hooker, f., Gen. PI. ii. 194, and by Hoffmann in Engl. &, Prantl, Nat. 

 Pflanzenf. iv. Ab. 5, 228, 233, the leading characteristics and literature 

 of the genus being as follows : — 



SABAZIA, Cass. (Name of obscure origin.) — Heads 1 to many, 

 6 mm. to 4 cm. in diameter (including the rays) ; involucral scales ovate, 

 mostly obtuse, subequal, 2-3-seriate ; disk convex or conical, chaff-bear- 

 ing. Flowers all fertile. Corollas of the disk-flowers cream-colored to 

 light yellow, shortly o-toothed; ligules of the ray-flowers 2 to 20 mm. 

 long, white to (externally) deep purple, 8-toothed. Achenes narrowly 

 obovate, 4— 5-angled, rounded at the summit; pappus none or of a few 

 minute caducous awns. — Branching annual or perennial herbs, leafy- 

 stemmed and often decumbent. Leaves opposite, ovate, entire or serrate. 

 — Diet. Sci. Nat. xlvi. 480 (1827); DC. Prodr. v. 496: Hemsl. Biol. 

 Cent. -Am. Bot. ii. 160. Baziasn, Steud. Nom. ed. 2, i. 192 (1840). 

 Sabbazia, Steud. 1. c. ii. 489 (1841). — A genus of plants which are 

 without doubt rather nearly related, but which still may not have had a 

 very recent common origin. In habit the species approach on the one 

 hand Jaegeria and on the other Tridax and Gaiinsoga. 



* Annuals. 

 -<- Achenes liispidulous. 



1. S. urticaefolia, DC. Hispid-pubescent throughout, glandular 

 about the inflorescence : heads several to many, small, (including the 5 

 short roseate rays) only 6 mm. in diameter. — Prodr. v. 497 (1836); 

 Hemsl. Biol. Cent.-Am. Bot. ii. 161. Gaiinsoga urticaefolia, Benth. in 



