CACTACEZ OF THE BOUNDARY. 219 
Plate XXXIV. E. INTERTEXTUS: 1, a plant of rather large size, in flower ; 2-5, young bunches of spines, more [66] 
or less ag ; 6-8, old bunches of spines ; 9, fruit, with a few scales, with wool at base and the dry flower on to 
10, se 
Plate XXXV., fig. 1-5. E. ipa var. DASYACANTHUS: 1, 1-2, young bunches of spines ; 8-5, old ones. — 
& 
Fig. 6-8. E. uNGUISPINUS: bunches of spin 
Plate XXXVI. CrEREUS VIRIDIFLORUS: 1, large plant, from the Limpia, in flower, one flower fully, another one half 
open; 2, bunch of spines of this plant without, and, 3, with a central spine; 4-7, bunches of spines of a specimen collected 
by Dr. Bigelow on the upper Pecos, with one or more central spines (4, a very young bunch; 5, a full-grown one; 6, a simi- 
lar larger one, like the former, with two central spines ; 7, another one, with the largest central spine curved upward) ; 
8-10, bunches s ae with and without a central spine, from gates collected by Dr. Wislizenus in northeastern New 
Mexico; 11, part of a plant in flower, with very obtuse petals and very small spines, collected by A. Fendler at Santa Fé ; 
12-13, bunches 7. spines of this variety; 14, fruit oo Santa Fé; 15, seed of the same; 16, fruit from the Limpia. 
Plate XXXVII. C. cHLORANTHUS: in full blo 
Plate XXXVIII. The same: 1, top view, oxbihtcihe the rays formed by the central spines; 2-7, different bunches of 
spines ; 8, a small fruit ; 9, one of usual size; 10, seed of common size; 11, smaller seed. 
Plate XXXIX. C. DASYACANTHUS: a simple, branchless plant, with one flower. 
Plate XL. The same: bunches of spines, different in size, number, and proportion of the spines ; all twice magnified. 
Plate XLI., fig. 1-2. The same: 1, fruit; 2, seed. — Fig. 3-5. C. Rarrert: 3-4, bunches of spines, magnified 
it. 
Plate XLII. C. crenorpEs: 1, a large specimen in flower; 2-8, front view and lateral view of a bundle of spines, 
twice magnified ; 4, top part of another specimen, in which the spines are not so closely pectinate ; 5-6, spines of this specimen, 
8 
Plate XLII. C. casprrosus: a specimen of one of the largest forms ; petals unusually curled. 
Plate XLIV. The same: 1-4, spines of the larger form, in different states of development, magnified twice ; 5-7, spines 
of the smaller form, also iia twice, — some of the bunches show rudiments of central spines; 8, a fruit with the rudi- 
ments of the flower shrivelled up ; 9, a fruit exhibiting yet the tube of the flower very distinctly ; 10-11, seed of the larger, 
and, 12, seed of the smaller ti 11, g, young seedling soon after germination. 
Plate XLV. C. LONGISE 
Plate XLVI. OC. srramrneus: One head out of a plant with numerous heads. 
Plate XLVII. The same: 1, another head with smaller spines, seen from above ; 2-4, bunches of spines; 5, fruit ; 6, seed 
of the same, usual size ; 7, seed of another specimen larger than usual. 
Plate XLVIII., fig. 1. A flower of the same. — Fig. 2-4. C. ENNEACANTHUS: 2, part of a stem showing the ribs and 
spines and a flower from El Paso; 3, flower of a specimen from Eagle Pass; 4, bunch of spines from El Paso, which, however, 
may belong to a form of C. a — lower central spine triangular and much flattened. 
Plate XLIX. The same: ead of a specimen from Eagle Pass; 2, another one with longer and stouter spines ; 
3-10, bunches of spines of plants are at ae Pass and at El Paso ; 10, with a curved central spine ; 11, fruit belonging 
to flower, fig. 3, of last page; 12, 
Plate L. C. pusius: 1, oa a a tik with a flower ; 2, bunch of ama and, 3, seed of same plant ; 4-5, bunches [67] 
of spines of another specimen ; 6, same, with flower just closed ; 7, fruit, and, 8 seed of sa 
Plate LI. C. FENDLERI: a vigorous head of a plant, brought saat El Paso 
Plate LIT. The same: 1, top of a plant with flower-bud bal flower, from El Paso; 2, fruit with few and stouter spines; 
seed of same; 4, fruit wey numerous slender spines; 5, seed of same; 6, another form of see 
Plate LIII. Zhe same: 1, flower, from Santa Fé; 2, young bunch of spines; 3-12, bunches of spines of different shape 
and size. 
Plate LIV. C. POLYACANTHUS: in flower; usual form with short sp 
Plate LV. The same: 1, part of a rib with a flower and a bud ; At seca of spines ; 5, fruit with a bunch of spines; 
6, seed of same; 7, fruit of another long-spined form ; 8, seed of same. 
Plate LVI. C. paucisprnus: 1, an entire plant; 2-5, bunches of ret 6, 
Plate LVII. C. nas eS 1, a head, brought from Soriora by A. shat 2, young, and 3-4, older bunches of 
spines of the same; 5, fruit; 6, seed of same; 7, seed of Dr. Parry’s Bs inal speci 
Plate LVIII. ©: a ASE 1, part of a plant with flower and cua 2-4, bunches of spines; 5, fruit ; 
6, seed. 
Plate LIX., fig. 1-11. ©. procumpens: 1, a plant with flower-bud, flowers, and young fruit ; 2-9, different bunches of 
spines ; 10, fruit; 11, seed. — Fig. 12. 2 TUBEROSUS : see 
Plate — fig. 1-4. C. Ewonvi : 1a fruit ;2, a ciier® of spines of this fruit ; 3, another one twice the natural size ; 
, seed. — Fig. 5-6. C. vaRraBILis: 5, fruit ; see 
Plate LXI. C. GIcaNTEuUs: 1, part of the rib of an adult plant with two bunches of spines; 2, a bunch of spines ; 
3, part of a young rib of an adult plant collected in March, spines very short and slender yet; 4-5, bunches of spines of a 
young plant about 8 inches high. 
Plate LXII. The same: 1, eit 2, fruit; 3, seed; m, side view of embryo, cotyledons a little open; m, front view 
of same. 
