1898] EUPHORBIAS OF DR. PALMER’S DURANGO COLLECTION 21 
EUPHORBIA ADENOPTERA Bertol, Misc. Bot. 3 : 436. 
In this species a deep cleft replaces the fifth involucral gland 
which is also represented by a linear sixth lobe, otherwise the 
involucre is not ‘profunde 
fissis.”’ The involucral lobes 
are more linear than ‘‘lan- 
ceolatis.” The seed is pinkish- 
white, strongly tetrangular, 
™™ long, and 0.5™™ broad, all 
the facets plane and deeply 
scored by four or five trans- 
verse pits, the ridges separating 
which are projected to include 
the angles of the seed. 
Dr. Palmer’s 898 Durango 
agrees exactly with a part of 
J.G. Lemmon’s Rucker valley 
and Churricahua mountains 
(Arizona) specimens. All these 
might be termed forma rosea, 
as the appendages and glands 
are so deep a red as to give 
the whole plant a roseate ap- 
pearance. My Chichen Itza 
Yucatan 107 Allison V. Armour Exped. specimens are also of 
this form, but differ in having all the stem leaves narrowly lan- 
ceolate like the intrafloral leaves of the usual form. Dr. Arthur 
Schott’s 966 Sisal, Yucatan, is apparently a transition from the 
last to the first form, while Dr. Gaumer’s 938 Izamal is more 
markedly like the Durango form, his specimens being the largest 
Ihave seen; his 939 Sitilpech is, however, a very straggling 
open growth with long virgate branches. 
§ CyTTAROSPERMUM. 
EUPHORBIA SUBRENIFORME Watson, Proc. Am. Acad. 21: 439. 
In this species the fifth involucral gland is represented by a 
