402 Field Museum of Natural History — Botany, Vol. II 



Chamaesyce cozumelensis comb. nov. 



Etiphorbia cozumelensis Millsp. Field. Mus. Bot. 2:261. 1900. 



A large number of sheets of this species show an intergradation from 

 the absolutely glabrous and glaucous original collection, on Cozumel 

 Island, through a form with a few long, scattered hairs in the capsular 

 sulci {E. cozumelensis pilosulca Millsp. ibid. 262) ; a form with a few long 

 hairs on the nodes, petioles and leaves; to plants densely long-pilose 

 throughout. The extremes of these plants appear like widely different 

 species but the characters do not warrant the application of even varietal 

 names. 



The distribution of the forms is as follows: The glaucous form — 

 Cozimiel Island, Millspaugh 1604, 1606, 1608, i6og, 1611; the form with 

 the capsular siilci hairy — Cozumel Island, Millspaugh 1501, 1502; 

 the form with the nodes, petioles and leaves long-pilose — Cozimiel 

 Island, Millspaugh 4Q, 53, Chichankanab, Gaumer 1456; whole plant 

 densely long-pilose — Mugeres Island, Millspaugh 24, Izamal, Silam 

 and Progreso, Gaumer J14, 62Q, 1887, 2407. 



Chamaesyce hirta (L.) Millsp. Field Mus. Bot. 2:303. 



I have gathered a large number of forms of this species from many 

 localities in Hawaii, south China, Straits Settlements, Java, the PhiHp- 

 pines, Burma, India, and from Bermuda, Florida and the Bahamas 

 through the West Indian islands, Mexico and South America to Pemam- 

 buco, Brazil. With all this material and a large number of sheets from 

 other collectors I can not satisfy myself that there is any specific dif- 

 ferentiation between E. hirta and E. pilulifera L,, capitata Lam., globuli- 

 fera Kth., verticillata Veil., nodiflora Steud., procumbens DC, obliterata 

 Jacq., ophthalmica Pers., discolor Engelm., gemella Lag., and Karwin- 

 skyi Boiss. the type material of all of which I have examined. These 

 are only intergradient forms and there are a multitude of others that 

 have luckily escaped specific nomination. 



Chamaesyce Rosei sp. nov. 



Annual, short-crispid-multicellular hairy. Root straight and deep; 

 stems many, terete, wiry; intemodes long; branches profuse, ascending. 

 Inflorescence in terminal, globose heads. Leaves inaequilateral, 

 narrowly lanceolate, 13-25 x 3-6mm., crisp-hairy on both surfaces and 

 with a broad, deep-red, central line of maciilation; apex acute; base 

 narrowing to the petiole; margin shallow-toothed toward the apex; 

 petioles short (about 2mm.); stipules mere aristate teeth about .8mm. 

 long. Involucres turbinate, roseate, sessile or nearly so, thin walled, 

 the outer surface pubescent the inner densely bearded; lobes deltoid. 



