JOHNSTON. — A KEVISION OF THE GENUS FLAVERIA. 283 



vision the writer has been working, and to Miss M. A. Day, librarian at 

 the Gray Herbarium, many thanks are due. 



FLAVERIA. Heads small, heterogamous or homogamous, 1- to 15- 

 flowered, rays usually only one. Involucral bracts 2 to 8, subequal, 

 sometimes with two smaller exterior bracts. Receptacle small, naked 

 or setose. Achenes liuear-oblong, glabrous, 8- to 10-ribbed, black. Co- 

 rolla 9 ligulate, from 1 length of achene to 3 or 4 times as long, entire, 

 emarginate or tridentate, upright or reflexed. Corolla $ regular, tur- 

 binate, o-parted. Corolla tubes villous or not, the hairs consisting of 

 6 to 12 short thick cells. Anthers at base obtuse, entire. Apex with 

 a conical appendage. Style of ^ flower 2-parted, reflexed, obtusely 

 rounded. Pappus usually none, in one species broad, scale-like, dentate, 

 or fimbriate. 



Herbs glabrous or puberulous, often yellowish or rubescent. Leaves 

 opposite, narrow, entire or dentate. Capitula narrow, sessile or with 

 short pedicels, borne in dense cymes or glomerules, which are pedunculate 

 or sessile, corymbose-paniculate or solitary at tips of branches. Corolla 

 pale to deep yellow. — Juss. Gen. PI. 186 (1789); Gmel. Syst. 1269 

 (1791) ; Willd. Enumeratio, 941 ; Persoon, Synopsis Plantarum, ii. 489 ; 

 Spreng. Syst. iii. 500, n. 2737 ; Less. Synopsis Generum Compositarum, 

 2.]5 ; DC. Prod. v. 635 ; Torr. & Gray, Fl. N. Am. ii. 360 ; Benth. & 

 Hook. f. Gen. PI. ii. 407; Hemsl. Biol. Cent.-Am. Bot. ii. 215; 

 Hoflfm. in Engl. & Prantl, Nat. Pflanzenf. iv. Abt. 5, 258. Vermifuga, 

 Ruiz & Pavon, Flora Peruviana Prod. 114, t. 24 (1798-1802). Mll- 

 leria, pro parte, Cav. Ic. PI. i. 2, t. 4 (1791). Brotera, Spreng. in 

 Schrad. Journ. iv. 186, t. 5 (1800). Nanemburgia, Willd. Sp. PI. iii. 

 2393 (1804). Broteroa, DC. Prod. v. 636 (1836). Selloa, pro parte, 

 Nutt. Am. Journ. Sc. v. 300 (1822). Gymnosperma, pro parte, DC. 

 Prod. V. 312 (1836). 



? § 1. Receptacle setose. 



* Leaves linear to lanceolate, entire or serrulate ; Australian. 



1 . F. AusTRALASiCA, Hook. Hcrbaceous, 30 to 60 cm. high ; stem 

 striate, glabrate : leaves with base dilate, linear-lanceolate, entire or ser- 

 rulate, glabrous, 3-nerved, .2 to 1.4 cm. wide, 2 to 7.5 cm. long: 

 heads densely glomerate, glomerules 1 to 2.5 cm. wide, subinvolucrate : 

 involucral bracts 2 to 4 : corolla 9 ligulate, lamina equalling tube or 

 nearly so, upright or oblique, entire, emarginate or tridentate, corolla 

 tube slightly villous : achenes nearly equal, 2.25 mm. long. — In Mitch- 

 ell's Journ. Trop. Austral. 118 ; Mueller, Frag. i. 183. — N. Australia, 



