E^qjJiorhirf.'] EUPIT0K})IACE.E (BroMn). 243 



♦* 



Spines reddish or brown, sometimes be- 

 coming grey with age; wtoms ^-IJ 

 in. thick : 



Stems transvei-sel}' banded with dull 

 green and whitish-green on the 

 growing part, S-10-angled ; angles 

 subacute .„ (139) alternicolor. 



Stems uniformly green (without baud.s) 

 on the gi'owing part ; involucre 

 sessile or A'ery shortly peduncu- 

 late : 

 Stems 7-angled ; angles subacute ; 



involucral glands dark purple... (137) pulvinata. 



Stems usually 8-10- (occasionally 7-) 

 angled ; angles obtuse ; in- 

 volucral glands greenish-yellow (13S) aggregata. 



riant 1-9 ft. high, mostly branched at the 



base or uj^P^i' p'^^t : 

 Stems 9-11 -angled ; 



Angles distinctly toothed ; flowering 

 peduncles 1^-3 lin. long ; in- 

 volucral glands dark purple or 

 blackish-purple ; ovary puberulous (144) cereiformia. 



Augles not toothed ; flowering pedun- 

 cles 1 lin . (or more ?) long ; ovary 

 glabrous (^40) captiosa. 



Stems 4-8- (or in 146, E, lieptagona, 

 sometimes up to 10-) angled ; in- 

 volucral glands purple or purple- 

 brown : 

 Plant 4-9 ft. high ; spines light brown ; 

 flowering peduncles 2-6 lin. long ; 

 involucre 2 lin. in diam 0^5) pentagona. 



Plant up to 2 ft. high; spines purple- 

 brown, becoming grey; flowering 

 peduncles 3-9 lin. long ; involucre 

 1^-lJ lin. in diam. (14G) heptagona. 



Spines in pairs along the angles of the 3-8-angled, or 



occasionally flattened 2-angled branches ; glands of 



the involucre entire or in 1G7, E, Schhrnt, with a 



slight notch on the margin : 



Spines A-2^ in. long; branches 2-G in. in diam., 3- 



angled, very deeply constricted into short sagittate- 



reniform segments (173) grandicornis. 



Spine?* 1-6 lin. Ion 



a 



tTreea 10^30 ft. high : 



Branche-s deeply constricted into short conical 

 or deltoid-ovate segments ; angles with broad 

 continuous horny margins ../ (l^-*) Cooperi. 



Branches constricted iuto elongated slightly conical 

 lanceolate or parallel-sided segments ; spine- 

 shields quite separate or in 178, E. Evanm 

 and 177, E. inanyularh, frequently united 

 into a very narrow continuous horny margin : 

 Flowering branches either more than 2 in. in 

 diam., or if less, then with the edges of the 

 angles between the spine-shielJ^ 2i 3 lin. 

 thick; ' ■ 



K 



9 



