160 Contributions from the Gray Herbarium 
minusve sericeo-pilosis, pappi squamellis 4 laciniatis vel fimbriatis, 
Species typica Tithonia pusilla Gray (= V. pusilla (Gray) Blake). 
— Two species of Peru. 
margin and down middle of sides ....... 112. V. simsioides. 
ESS ne tee geet ap gee 113. V. pusilla. 
112. V. simsioides Blake. Paniculately branched annual, 
5.5 dm. high, the stem glabrate below, striatulate, above especially 
in inflorescence glandular-pubescent, the hairs spreading, thick- 
ened at base. Lowest leaves (about 4 pairs) opposite, obovate to 
ovate, acute, cuneate at base, dentate (teeth triangular, depressed), ‘ 
scabrously tuberculate-hispidulous, thin, 3-nerved, 4-7 cm. long, — 
2-2.7 cm. wide, on submargined petioles 1-1.5 cm. long; the 
upper ovate to lanceolate, acuminate, gradually reduced. Pe- 
duncles naked or bracteolate, monocephalous, 4.5-8 cm. long; 
heads 2.8-3.5 cm. wide; disk 8-11 mm. high, 12-15 mm. thick. 
Involucre 2-seriate, graduated, 7-9 mm. high, the phyllaries linear, 
mm. wide, obtusish, densely hispid-pilose, reflexed, with indur- 
ated base and subherbaceous apex. Rays 10-12, yellow, oblong- 
oval, 11-12 mm. long, 4.5-6 mm. wide; disk-corollas yellow below, 
purplish above, puberulous on the tube, 5 mm. long (tube 1.2 mm.)- 
_Pales obtuse, sparsely glandular, 7 mm. long. Achenes black, 
silky-pilose on margins and down middle of sides, crustaceous at 
base, 3.5-4 mm. long. Awns dilated at base, 1.3-2 mm. long: 
Squamellae 4, quadrate, free, laciniate, 1 mm. long. — Blake ! 
Bot. Jahrb. liv. Beibl. no. 119. 48 (1916). — PERU: mountains — 
north of Chosica, 1500-1600 m., 17 April 1910, Weberbauer 5355 
(type: Ber., photog. and fragm. G.); Purruchuca, Mathews 1042 
(K., fragm. G.). — Named from its resemblance, particularly ™ 
involucral features, to Simsia amplexicaulis (Cav.) Pers. 
113. V. pusilla (Gray), comb. nov. Slender erect annual, simple 
or sparsely branched, 11-14 em. high, the stem slender, striate, — 
rather sparsely hispid-pilose with ascending hairs with slightly 
tuberculate bases, and somewhat granular. Leaves few, opposite 
below (about 3 pairs), alternate above, narrowly lanceolate, nat 
rowed to an obtuse apex, acuminate at base, subentire, tripli- 
nerved, rather densely and harshly tuberculate-hispid or tuber- 
culate-hispid-pilose with ascending or subappressed hairs, slightly 
