EXPLANATION OF PLATES. 65 
8, a small tubercle from above ; 9, a young one with the silky wool yet straight and smooth ; 
10, a young tubercle bearing a fruit, which becomes visible after separating the wool ; 11, seed. 
Pr. 17, Ecurvocactus Scnrerim: 1, a full-grown plant in flower; 2, part of a rib, front view, 
showing the form of the tubercles and their grooves ; 3, part of a rib, side view; 4-6, bunches 
of spines ; 7, seed. 
Pu. 18. Ecutnocacrus BREVIHAMATUS: a full-grown plant of ordinary size. 
Pu. 19. The same: 1, part of a rib, side view, to exhibit the tubercles and their grooves ; 2, 
part of a rib almost in front, with a flower; 3, a tubercle with a flower at the base of the long 
groove; 4, a young bunch of spines from a small specimen ; 5-8, bunches of spines from differ- 
ent full-grown specimens. 
Pr. 20. Ecurvocactus setisprnus: 1, top of a plant with flower; 2, another flower ; 3, flower 
bud ; 4-6, bunches with twelve radial and one central spine of different size and shape; 7-9, 
bunches with more radial, and sometimes more central spines; 10, bunch of spines with two | 
almost straight central spines; 11, fruit; 12, several seeds attached to the funiculi, four times 
magnified ; 13, seed of the usual size and form; 14, larger seed of a specimen from Eagle Pass, 
to which spines fig. 8, belong. 
Pu. 21. Ecnrnocactus LoncewAMaAtus: part of a rib with a flower. 
Pi. 22. The same, a rib, side view, showing the tubercles, and with their short grooves and 
their flexuous spines. . 
Pu. 23. The same: 1, a bunch of spines of the longest spined variety ; 2, a fruit; 3, seed; 4 
and 5, bunches of spines of the smaller variety. 
Pu. 24. The same: 1, a bunch of spines of the thick spined Mexican form; 2 and 3, lower 
central spines of the same; 4, seed of the ‘“ Limas agrias,’’ the sour cactus-berries of Saltillo, 
to exhibit the peculiar form of the seed, and the great favosity of the surface. 
Pu, 25. Ecurnocactus Wistizext: 1, upper part of a rib with a flower and a flower bud; 2, 
pistil ; 3, fruit; 4 and 5, seeds of different form and surface, from El Paso; 6, seed of different 
shape, from the upper Gila. 
Pu. 26. The same: 1-3, bunches of spines of different shape and proportion. 
Pu. 27. Ecurvocactus Le Conter: 1, part of a rib with a fruit; 2, a bunch of spines; 3, a 
flower ; 4, section of same; 5, seed. 
Py. 28. Ecnryocacrus Emoryr: 1, bunch of spines of a large specimen, from Guaymas; 2, 
young bunch of spines with flower, from Sonora ; 3, section of flower. 
Pi. 29. EcHINOcACTUS VIRIDESCENS: 1 and 2, bunches of spines of a young init 3, flower ; 4, 
pistil; 5, fruit, not fully ripe and therefore a little shrivelled ; 6, seed. 
Pu. 30. Ecurnocactrus cyLinprAcevs: 1, a bunch of spines of a young specimen ; 2-5, shapepiee 
of spines of older, but not yet fully grown specimens. 
Px. 31. Ecurnocactus HORIZONTHALONIUS, in Sower. 
Pu. 32, fig. 1-5, the same; 1, a young plant ; ; 2-4, apue< of different forms; 5, seed. 
Fig. 6-7. Ecuryocactuy Parry, bunches of spines. 
Pi. 33. Ecutvocacrus Texensis: 1, a larger; 2, a smaller bunch of spines; 3, eek: 4, 
fruit ; 5, seed from Texas; 6, seed from Matamoras, smaller and more distinctly marked than 
fig. 5. 
Fig. 7. Seed of Ecurocacrus Sanprtiox, Gay, from Chili, which has also a woolly fruit. 
Pr 34: ‘ECHENOcACTUS INTERTEXTUS: 1, a plant of rather large size, in flower; 2-5, young 
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