64 Field Columbian Museum Botany, Vol. 2. 



Porto Rico (1776, 275 pt.). Specimens from the south coast of 

 Culebras Island (1781, 625 pt.) have narrower leaves, but all the char- 

 acters of the species. Specimens with very long leaves 5-6 x. 6 cm. 

 from the sandy sea beach west of Port of Ponc, Porto Rico (675). 

 In this species the lobes of the involucre are almost without special 

 form, being involved in the structure of the hairy ring that surrounds 

 the internal involucral-margin; in our specimens the glands have no 

 vestige of appendages, the fifth gland is replaced by a very slight 

 sulcus flanked by two larger involucral lobes (?). The seeds are 

 ovate 2. 1 x 1.3 mm., apiculate, the dorsal angle obsolete, all facets, 

 scrobiculate. 



Euphorbia Armourii Millsp. Field Col. Mus. Bot. 1:28, pi. 2. 



Open glade beyond (east of) San Miguel, Cozumel (1569, 1570). 

 Of these specimens 1569 corresponds exactly with the type while 

 1570 has minute leaves 4-6x3-4 mm., and the general habit appear- 

 ance of E. astroites F. & M., but with seeds and involucres typical 

 of Armourii. This species is clearly distinct from E. ocymoidea L. 

 to which it bears a close habit resemblance. 



Euphorbia Mayana Millsp. Field Col. Mus. Bot 1:304, pi. 16. 



Chichen Itza, the ancient capital city of the sacred Mayan ltzae^ 

 Yucatan (1619). The plants of this collection agree exactly with the 

 type. 



Euphorbia petiolaris Sims Bot. Mag. t. 883. 



Waste grounds in the suburbs of Charlotte Amalia, St. Thomas 

 (477); and in maritime thickets along the south shore of Culebras 

 Island (603). 



Euphorbia heterophylla Linn. Am. Acad. 3U12. 



Borders of open woods and in fallow fields near Walsingham, 

 Bermuda (87); ditches in the suburbs of San Domingo city (844); 

 about San Miguel, Cozumel (1504); open woods Chichen Itza, Yuca- 

 tan (1627, 1629); and fields south of Progreso (1680). The usual 

 forms of the species. 



Euphorbia heterophylla graminifolia Engelm. Bot. Mex. Bound. 190. 

 Old fallow clearings near Walsingham, Bermuda (105); suburban 

 fields San Domingo city (841); fallow clearings near the center of 

 the island of Grand Cayman (1374); a< - Spot Bay (1783); and near 

 Georgetown (1394). The usual form of this variety with a profusion 

 of linear-lanceolate leaves from 4.5-6.5 x .6 cm. 



Euphorbia heterophylla cyathophora (Murr.) Boiss. in de C. Prod. 

 15:262. 

 Old fields suburbs of Charlotte Amalia, St. Thomas (453), and 

 Catano, Porto Rico (1774). Leaves all cyathoform from the base 

 to the apical inflorescence. 



Euphorbia hypericifolia Linn. Sp. PI. 154. 



The field of this cruise being that from which Linnaeus' plants 

 were derived, from a combination of several forms of which he 

 formulated the type description of this species, I took pains to gather 



