218 CACTACEH OF THE BOUNDARY. 
APPLANATA : a upper part of plant in flower and fruit ; 5-6, different views of flowers; 7, fruit; 8, seed, — all from the same 
specimen from El Paso; 9-14, bunches of spines of different forms of the same variety, from western Texas. — Fig. 15-17: 
bunches A spines and seed of the var. HEMISPHZKICA, from Matamoras. — Fig. 18-20. M. GuMMIFERA: different views of 
tubercles and spines. 
Plate X. M. Ecuinus: 1, whole plant in fruit ; 2-3, tubercles sen the groove and the wool on the basal areola ; 
47, aces of spines of younger ee older plants ; 8-9, same, with the central spine curved ; 10, fruit; 11, 
. M. pectinata: 1, whole plant in flower; 2-3, diffe oor views of tubercles from is sides a the plant ; 
4-7, fee of spines ; 8-9, ide from the wer-bearing top of larger plants ; 10, 
Plate XII., fig. 1-16. M.TUuBERcULOSA: 1, a large specimen in fruit ; 2-11, tuber ie sal bunches of spines of different 
2 neg (2-3, from a young plant; 10, a very Fits tubercle), — all the ‘Agharoles exhibit the large mass of dense wool at 
ag + ae 13, flower ; 14, fruit; 15, seed of the same ; 16, seed of another specimen, smaller, and with smaller 
marks. — Fig. 17-22. M. DasyAcANTHA: 17-20, tubercles and bunches of spines of different specimens ; 21-22, seeds of 
Plate XIII. M. raprosa, var. Neo Mexicana: 1, a plant with several branches in flower; 2 and 8, different tubercles 
with bunches of spines, the woolly grooves extending more or less down along the upper side of the tubercle ; 4, a bunch of 
spines ; 6, a fruit ; 7, seed. 
Plate XIV. M. MACROMERIS in flower. 
Plate XV. The same: 1, one of the largest bunches of spines; 2, one of the smallest ones; 3, a young tubercle not 
fully developed ; 4, a young hak full-grown tubercle, bearing the flower at the lower end of the woolly groove, far above 
the axil, a younger tubercle attached to it; 5, a ripe fruit, with a few scales; 6 and 7, seeds of the largest and the 
smallest kind. 
Plate XVI. M. Fissurata : 1, a flowering plant; 2, petals ; 3-9 tubercles of different size and age and in re: 
positions ; 3, a large tubercle from above; 4, same from below; 5, same from the side; 6, a smaller one, with few 
divisions from above ; 7, side view of same ; 8, a small tubercle from above; 9, a young one, with the silky ete eer} [65] 
straight and smooth ; 10, a young tubercle bearing a fruit, which becomes visible after separating the wool; 11, seed. 
Plate XVII. iy ise ae ScHEErt : 1, a full-grown plant in flower ; 2, part of a rib, front view, showing the form 
of the ae and their grooves ; 3, part of a rib, side view ; 4-6, bunches of spines ; 7, seed. 
Plate XVIII. E. prevrHamartus: a full-grown plant of ordinary size. 
Plate XIX. The sume: 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 different full-grown specimens. 
Plate XX. E. sETISPINUSs: 1, top of a plant with flower; 2, another flower; 3, Aower-bud; 4-6, bunches with 
12 radial and 1 central spines of different size aud shape; 7-9, bunches with more radial and sometimes more central spines ; 
10, bunch of = 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 
Plate XXI. E. LONGEHAMATUS : part of a rib, with a flower. 
Plate XXII. The same: arib, side view, showing the tubercles, and with their short grooves and their flexuous spines. 
Plate XXIII. The same: 1, a bunch of spines of the longest spined variety ; 2, a fruit; 38, seed; 4 and 5, bunches of 
spines of the smaller variety. 
Plate XXIV. 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 - — agrias, the sour cactus-berries of Saltillo, to exhibit the peculiar form of the seed and the great 
Sencalty of the surf 
Plate XXV. : WIsLizent : 1, upper part of a rib with a flower and a flower-bud ; 2, pistil; 8, fruit; 4 and 5, seeds 
of different form and surface, from El Paso; 6, seed of different shape, from the upper Gila. 
Plate XXVI. The same: 1-3, Sesiaboee of spines of different shape and proportion 
Plate XXVII. E. Le Conrer: 1, part of a rib with a fruit ; 2, a bunch of aden: 3, a flower; 4, section of same; 
Plate XXVIII. E. Emoryr: 1, bunch of spines of a large specimen, from Guaymas; 2, young bunch of spines with 
flower, from Sonora; 3, section of flower. 
te XXIX. E. vintpescens: 1 and 2, bunches of spines of a young plant; 3, flower; 4, pistil; 5, fruit, not fully 
ripe, and therefore a little shriveled ; 6, 
Plate XXX. E. cytinpRacevs: 1, a bunch of spines of a young specimen ; 2-5, bunches of spines of older but not yet 
fully grown specimens. 
Plate XXXI. E. HoRIZONTHALONIUS : in flower. 
Plate XXXII., fig. 1-5. The same: 1, a young plant ; 2-4, spines of different forms; 5, seed. — Fig. 6-7. E. PARRYI: 
bunches of spines. 
Plate XXXIII., fig. 1-6. E. Texensts: 1, a larger, 2, a smaller bunch of spines; 3, flower; 4, fruit; 5, seed from 
Texas; 6, seed from Matamoras, smaller and more distinctly marked than fig. 5. — Fig. 7, seed of E, Sanp1uton (Gay), from 
which has also a woolly fruit. 
