242 EUPTTOKisiACE.E (Browii). lE^iiliorhia. 



Stalk of spine clusters ^-2^ lin. long ; spines 



-1 lin. thick, gvey ... (153) astrispina. 



Stem about 5-7-angle(lj transversely banded with 

 pale green and darker green ; peduncles 

 usually bearing an umbel of 2-5 involucres, 

 but occasionally only one ... ... ... (154) Pillansii. 



J:JSpines all entire : 



Stems 2-4 J in. thick, with 10-20 angles ; i>eduncles 

 1^3 lin. long : 

 . Stem-angles 1-1^ in. prominent ; main spines 

 •4-10 lin. long, stout, with 2-4 smaller 

 fjpines at tlieir base, all croAvded ... ... (150) horrida. 



Stem-angles J~g in. prominent ; main spines 

 2-4 liu. long, solitaiy or with 1-2 smaller 

 Hpines or remains of pedimcles at their bjise (151) polygoua. ■ 



Stems or flowering branches ^-2 in. thick : 



Stems divided along the angles into verj' short 



and very obtuse tubercles by impressed 



lines (tessellately tuberculate) ; spines 



usually reddish or purplish when young, 



becoming pale brown or grey ; peduncles 



-2 lin. long : 



Plant 4-8 in. high ; branches |-1 in. thick, 



7-10-angled ; involucre dark purple .,, (141) submam- 



millaris 



Plant 1-3 ft. high ; branches 1-1 J in. thick, 



7-17-angled; spines J-| lin. thick : 



Tubercles on the stem-angles without or 



with no very evident raised line across 



them ; involucre dull purple ; styles 



united into a column 1 lin. long \., (142) mammillaris. 



Tubercles on the stem-angles with a very 

 evident raised line across them ; in- 

 volucre gi-een ; styles united into a 

 column J lin. long (143) fimbriata. 



Stems not divided along the angles into tubercles 

 by impressed lines, but the angles some- 

 times toothed : 

 Spines frequently or mostly curved, often 1 

 lin. thick at the base, some smaller : " 



Sterns or branches l:|-lf in. thick, 9-12- 

 angled ; spines J-IJ in. long, brown, 

 becoming grey ... .;. (14S) ferox. 



Stems or branches |-1J in. thick, 6-7- 

 angled ; spines J-2^ in. long, dark red 

 or blackish-purifle, becoming grey ... (147) enopla. 



Spines all straight, J-1 in. long, J-J lin. 

 thick at the base : 

 Plant apparently with a single stem 9-1 (t 

 in. high, 10-12-angled ; angles ap- 

 parently not very x^roniinent, obtusely 



rounded... ... ,.,: ... /.. (149) cucumerina. 



Plant 2!-8 in. high, branching at the base 



into many stems, often forming den>e 



s[viny euahion-like masses ; 



Spines black ; stems with G-9 broadly 



rounded angles ; peduncles 2 lin. 



(or more ?) long „, .,, .,. (136) atrispina. 



