über 44gave und Fourcroya. 677 
margine spinoso-denticulatis, dentibus remotis parvis corneis vel ima basi 
subcarnosis, margine inter eos herbaceo integerrimo, spina putas va- 
lida subulata rigida aeque ac dentes purpureo -fusca. 
Acaulis. Folia in planta quadrienni 17, -2-pedalia, erecto-paten- 
tia, recta vel parum retrorsum curvata, stricta, glabra, glaucescentia, li- 
nearia longe attenuata indeque pugioniformia, margine remote spinoso- 
denticulata; dentes parvi, ima basi saepius subcarnosi, sursum cornei 
complanati, deltoidei, acuti, recti vel antrorsum uncinati, purpureo-fusci; 
margo inter dentes herbaceus, integerrimus, nudus, glaber; spina termi- 
nalis valida, 6-8/^ longa, subulata, rigida, purpureo-fusca vel nigricans, 
basi parum in marginem decurrens. 
Crescit in imperio mexicano. 
17. AcaAvE Kanwiwsku Zuccar. 
À caulescens, foliis laete viridibus e basi orbiculariter dilatata late 
lorato-linearibus rigidis, superne concavis, remote spinoso-dentatis, den- 
tbus rectis vel uncinatis cuspidatis totis corneis nigricantibus, margine 
inter dentes herbaceo, spina terminali valida recta nigricante, utrinque in 
marginem corneum plus minus decurrente. 
Planta suppetens quadriennis. Caulis circiter 3 pollices altus, dia- 
metro 2". Folia erecto-patentia, rigida, basi orbiculariter dilatata am- 
plectentia, sursum late lorato-linearia, a basi ad medium usque supra 
plana, inde apicem versus concava, subtus convexa, 17, pedes longa, 
1-17, pollices lata, glabra, laete viridia, margine spinoso-dentata; den- 
tes remoti, apicem versus saepius subnulli, toti cornei, complanati, sub- 
deltoidei, cuspidati, recti vel uncinati, nigricantes; margo inter dentes 
herbaceus, nudus, glaber. Spina terminalis crassa, rigida, recta, 8-10 li- 
neas longa, cornea, glabra, nigricans, basi utrinque (pollicis circiter lon- 
gitudine) in marginem corneum nigricantem integerrimum decurrens. 
Crescit in imperio mexicano. 
