APRIL, 1904. PLANTS YUCATAN^E MILLSPAUGH & CHASE. 143 



Pectis prostrata Cav. Ic., 4:12, t. 324. 



A low, diffuse, prostrate or procumbent annual, with angled stem 

 puberulent in 2 lines, and opposite, clasping, oblanceolate, subacute 

 leaves with a narrow membranaceous 

 margin produced into long pectinate 

 bristles toward the base, leaves con- 

 spicuously dotted with round oil 

 glands. Inflorescence of terminal and 

 axillary clusters of 1-3 sessile or sub- 

 sessile heads. Heads 7.5 mm. high, 

 2.5-3 mm. broad, ray flowers 5, disk 

 flowers 5 or 6. Involucre oval-cylin- 

 drical, bracts 5, oblanceolate, rounded, 

 -concave-keeled, a tuft of hairs at the 

 subacute tip. Ray corollas reddish 

 orange, ligule narrowly oblong, entire, 

 2 mm. long, erect; disk corollas 5 

 lobed. Receptacle minute, convex. 

 Achene black, .5x3.7 mm., linear- 

 oblanceolate; in section biconvex (or in ray achenes subplano-convex) ; 

 obscurely 4 angled, papillate-striate, pilose on the angles and summit; 

 pappus of 5 thin laciniate scales connate at base (on ray achenes re- 

 duced to 2) 1.5-2 mm. long. 



Hab. Merida, Aug. 20, 1865, Schott S33J along roadsides near 

 Izamal, Gaumer 778, "common on roadsides in forests" Izamal 1092. 



Pectis Schottii (Fernald) comb. nov. 



Pectis t long ata Schottii Fernald Proc. Am. Acad. Sci. 33:78. 

 An erect, slender, paniculately branching annual about 35 cm. 

 high, with scabrous or smooth-angled stem and branches and oppo- 

 site, sessile, linear-oblong, apiculate, entire leaves, 

 1-2.5 cm - l n g> I ~ 2 mm. wide, with 3-5 pairs of 

 bristles at the base and 2 rows of prominent oil 

 glands beneath. Inflorescence of scattered, soli- 

 tary, terminal and axillary heads on capillary, 3-4 

 bracteate peduncles, 2-3 cm. long. Heads 3.8-4 

 mm. high, 2.5 mm. broad (in flower), somewhat nod- 

 ding at first, becoming erect in fruit, ray flowers 4 or 

 5, disk flowers 3 or 4. Involucre narrowly campanu- 

 late (widely spreading in fruit), bracts 5, becoming 

 involute, lanceolate, acuminate, bearing a few oil 

 glands on the thickened mid-nerve. Ray corollas 

 greenish white, faintly tinged with purple, ligule 

 oblong, emarginate, i mm. long, disk corollas 

 whitish, nearly entire. Receptacle convex. Achene 

 black, .25 x 2.2 mm., linear-oblanceolate; in section 

 oblong, the angles rounded; obscurely 5 nerved, sparsely pubescent or 

 nearly glabrous when mature, pappus of about 15 unequal rufescent, 

 upwardly scabrous bristles, slightly dilated below, 1-2.2 mm. long. 

 "Much more slender [than P. elongata H. B. K.] with very slender, 



