JAN. 1898. FLORA OF YUCATAN MILLSPAUGH. 373 



EUPHORBIA HETEROPHYLLA Linn. Am. Acad., iii., 112. 



"Herb 3 feet high, along old fence rows and in old fields 

 about Izamal, in flower from September to December " (903). 

 The usual form of the species with cuneate-lanceolate irregularly 

 serrate leaves, smooth capsules, and virgate sparsely leafy 

 branchlets. 



Merida, Sept. 30, 1865 (Schott, 960). "This plant is used for 

 washing clothing." 



Euphorbia heterophylla forma. 



" Herb 4 feet high, common at Buena Vista Xbac, September " 

 (1109). 



A peculiar form in which the stem leaves are broadly lanceo- 

 late, entire or minutely and distantly dentate-serrate, strigosely 

 short-hairy beneath; while those of the extended virgate branch- 

 lets are elongated-linear, quite resembling those of var. gramtni- 

 folia Engelm. This form, but with some of the lower leaves, 

 panduriform (E. heterophylla cyathophora (Jacq.) Boiss), was col- 

 lected in 1879 at Fountaindale, Oregon, and Byron, Illinois, 

 U. S. A., by the late Mr. M. S. Bebb. 



EUPHORBIA HETEROPHYLLA CYATHOPHORA (K. and G.) Boiss de C. Prod., 

 xv., 262. 



Merida, 1865 (Schott, 961}. This form of a very varied sub- 

 species is completely vested with cyathiform leaves, from those 

 of the base to the floral at the apex. Generally the basal leaves 

 only distinguish the variety, the apical being either lanceolate or 

 linear. The nearest counterpart of this plant was grown by. Dr. 

 Geo. Engelmann from seed sent him from Texas. (See sp. in 

 U. S. Nat. Herb.). 



Euphorbia lasiocarpa Klot. Nov. Act. xix, Supl. 414. 

 Merida, Aug. 23, 1865 (Schott, sine num.}. 



EUPHORBIA MAYANA Millsp. Field Col. Mus. Bot., i., 304. 



" Open grounds at Buena Vista Xbac, April" (1039). Differs 

 from the type collected near Izamal, only in having somewhat 

 deeper and more irregular dentations in the margin of the append- 

 ages. Tekanto, shrub 5-8 feet high, branches short, horizontal, 

 flowers yellowish-white, Feb. 25, 1890 (Stone, 211, in Herb. Acad. 

 Sci. Phila.). 



Euphorbia pilosula Engelm in litt. 



" Herb 8 inches, common in the forests of Buena Vista Xbac, 

 August" (1103). 



EUPHORBIA PILULIFERA PROCUMBENS (de C. ) Boiss. de C. Prod, xv., 21. 

 Merida, at Quinta del Obispo, Nov. 24, 1864 (Schott, j6~). 

 Merida, 1865 (Schott, 967}. "Prostrate herb, abundant in shady 

 places near Izamal, November " (1003). 



