174 CACTACEZ OF WHIPPLE’S EXPEDITION. 
CEREUS TRIGLOCHIDIATUS, E.: 6, upper part of a large head, with a flower; 7, part of a rib of another 
specimen, with smaller curved spin 
Fig. 8. Crreus its couaee. E. & B.: part of a rib, with 3 bunches of spines 
Fig. 9. Cereus Mosavensis, E. & B., var. ZUNIENSIS: part of a rib, with 2 Panchie of spines. 
Plate V. fig. 1. Crrevs Hexaprus, E. & B.: upper part of a head. 
& B. 
igs. 2~3. CEREUS GONACANTHUS, E. : 2, part of a rib, with 2 bunches of spines ; Ae another fascicle of spines, — 
the 3 pong of Tea show all a different ‘edtiection of the central ee the upper radial spine 
Fig REUS ENGELMANNI, var. VARIEGATUS, E. & B.: 4 and 5, 2 bunches of aa showing a different arrange- 
ment of aie spines ; 6, fruit; 7, seed, —a@ natural size, b eA 8 diameters, c part of the surface still more magnified 
to show the irregular tuberculation. 
Figs. 8-10. Cereus ENGELMANNI, var. CHRYSOCENTRUS, E. & B.: 8, part of 2 ribs, with numerous spines ; 9, a single 
bunch be spines ; 10, fruit, sterile and perhaps not fully developed. 
late VI. figs. 1-3. OvunTIA cHLoroTIca, E. & B.: 1, joint with a flower, — the flower to be reconstructed from a 
withered specimen collected in Jannary ; 2, sterile and probably undeveloped fruit ; 3, fragment of the bark of the lower [55] 
part of the plant, with several large bunches of spines. 
igs. OPUNTIA PROCUMBENS, E. & B.: 4, part of a joint; 5, larger bunch of spines from another specimen. 
Plate VII. figs. 1-2. Opuntia occtpENnTALIs, E. & B.: 1, joint of the usual shape and size ; 2, fruit. 
Figs. 3~4. OpunTIA Ancustata, E. & B.: 3, a large and less spinous joint, with a sterile degenerate spinous fruit ; 
4, asmaller, more spinous joint, with a full-grown ripe fruit. 
Plate VIII. fig. 1. Opuntia ENGELMANNI, var. cycLopgEs, E. & B.: with ripe fruit. 
. 2-38. OPUNTIA ToRTISPINA, E, & B.: 2, fragment of a joint with fewer set and ripe fruit ; 3, part of a more 
spiny joint. 
Plate IX. figs. 1-5. Opuntia Camancnica, E. & B.: 1, a joint with shorter and lighter-colored spines ; 2, a joint with 
larger and darker spines ; 8, fragment of a joint with more numerous and crowded spines; 4 and 5, ripe fruit of the smaller 
and largest size. 
Figs. 6-8. OPUNTIA a cpa E. & B.: 6, a younger bunch of spines; 7, another from the oldest part of the plant ; 
8, a sterile and degenerate fru 
Plate X. figs. 1-2. Opuntia vuLcarrs, Mill.: 1, a young joint with leaves, — the older one has a single sjiine and bears 
a flower-bud ; 2, a single leaf magnified 4 diameters. The figures of this species have been introduced to exhibit the diagnostic 
characters and its difference from the next species. 
igs. 3-5. Opuntia Rarinesquu, E.: 3, an older joint with a flower and a bud, and a younger half-grown joint with 
leaves, — this represents the spinous form common in Illinois, Missouri, and Arkansas; 4, an older joint of the variety with 
few spines, pwns numerous fruits of different shapes, as they often occur in the same plant; 5, two leaves of different sizes 
magnified 4 diamete 
Plate XI. fig. 1. Opuntra RaFINEsquir, var. MINoR, E.: the larger joint spineless, the upper one spiny on the 
rgin. 
Figs. 2-3. OpunTIA RAFINESQUII, var. GRANDIFLORA, E.: 2, a joint with flower; 3, fru 
Fig. 4. Opuntia FuscoaTtra, E.: a joint with a young fruit just after flowering ; Sint of an older, very bristly 
joint visible. 
Plate XII. figs. 1-3. Opuntia CYMOCHILA, E. & B.: 1, ajoint; 2, a single bunch of spines; 3, ripe fruit. 
Figs. 4-6. OPUNTIA sTENocHILA, E. & B.: 4, a joint; 5 a » a asia and large fruit. 
Figs. 7-8. Opuntia FusiForMIs, E. & B.: 7, a joint; 8, 
Fig. 9. OPUNTIA BRACAYARTHRA, E. & B.: a whole in a 2 withered flowers. 
Plate XIII. figs. 1-5. Opuntia pastiarts, E. & B.: 1, a joint somewhat shrivelled as it appears in winter, a late young 
joint near its base appears more plump and fresh ; 2, flower; 3, style; 4, undeveloped sterile fruit ; 5, a whole plant reduced 
in size to show the singular manner of h. 
Figs. 6-7. OPUNTIA spH#RocARPA, E. & B.: joint and fruit. 
Figs. ae Opuntia Ertvacea, E. & B.: 8, joint of the usual shape (only partly finished) ; 9 and 10, bunches of 
spines; 11, frni 
Plate XIV. figs. 1-3. aor Missovrtensis, var. RUFISPINA, E. & B.: 1, a joint (only partly completed) ; 2, @ very 
fuli bunch of spines ; 3, fru 
Fig. 4. OpunTIA aia nas var. PLATYCARPA, E.: 
Figs. 5-7. Opuntia MIssourIENsis, var. cpitidoea ae ng " as en) with flower; 6, bunch of spines; 
7, fruit. 
Figs. 8-10. Opuntra Missourrensis, var. aupispiva, E. & B.: 8, joint (unfinished); 9, bunch of spines; 
10, fruit. 
