304 



FlKI.I) COI.UMHIAN MUSKU.M^BOTANV, VoL. I. 



Dalechampsia scandens Linn. 



Climbing \ine 6 feet. Frequent in stony places near Izanial, 

 Feb. to March (4H0). 



Euphorbia adenokikra Bertol. 



Abundant on the roofs of houses at Silam, April (629). 



Euphorbia astroites Fisch. & Mey. 



Frequent in caves and on rocks in shady places near Izamal, 

 Sept. to Feb. (521). 



EiPHORHiA HETERoi'HVLi.A Linn. Hobonkak. 



Common in damp shady places about Izamal, July to March 

 (512). 



Euphorbia heterophylla cyathophora (Murr.) Boiss. 



A simple stemmed rigidly erect form, 2 to 3 feet high, with the 

 leaves all clustered about the apical inflorescence. Frequent in 

 shady places about Izamal, Aug. to Sept. (862). 



Eri'HORHiA HVPERiciFOLiA Linn. 



Herb 18 inches high. Common in shady places during the 

 dry season, Izamal, Feb. (508). 



Euphorbia pilulifera procumbens (DC.) Boiss. Xanabmucuy* 



Very abundant on cultivated lands about Izamal (315)- Com- 

 mon on waste grounds near Merida [Vaidcz, 2). 



Euphorbia Preslii Guss. 



Herb 5 feet high during the wet season. Abundant on vacant 

 grounds about Izamal, Aug. to Sept. (882). 



Euphorbia rhytisperma Engelm. Xancalmucay. 



Abundant on stone walls about Izamal (460). 



Euphorbia serpyllifolia Pers. 



Cultivated lands about Izamal (315 in part). 



Euphorbia thymifolia Burm. 



Along fences and in shady places near Izamal, uncommon, 

 June to Jan. (314 in part). 



Euphorbia Mayana sp. nov. (Plate XVI). Sac-chacah. . 



i^ Alcctoroctoinim. Slirubby 3 to 15 feer high, stems erect sub-j 

 ligneous witlely branching, whitish-ribbed, swollen-articulate/ 

 branches opposite, internodes 2 to 2.5 inches long. Leaves 

 axillary and more or less ternate on the cymes, all alike, petiole^ 

 somewhat longer than the ovate-obtuse, basally acute, palt 

 smooth, fleshy leaf. Inflorescence cymose-paniculate, 4 to iS 

 capitate, axillary or terminal on the slender branchlets; pediceW 

 somewhat longer than the smooth campanulate involucresj 

 involucral lobes spatulate, fimbriate-dentate, glands brownj 

 plane, broader than the greenish-white crenate appendagesJ 



♦ Applied in general to the small prostrate species of Euphorbia. 



