KEY TO SUB-CLASSES, ORDERS AND GENERA. 155 
LII--ONAGRACE— 
(1) Calyx tube linear, scarcely produced above the ovary ; teeth 4—6 acute 
persistent; petals 4—6, epigynous: oe 4-celled, 8- ribbed, breaking up 
between the ribs :— sf cedxlii—J ussix a. 
(IL) Calyx funnel-shaped, sometimes very long tubed, “4-parted, deciduous ; 
potals 4, on the mouth of the “ives ied tube ; fruit an oblong, bluntly 4-cornered, 
berry :— ses as Ree x ons ..  edxli--Fuchsia, 
LITI--SAMYDACE®-- 
[Botanical note—The two genera here described are iccluded by Warburg in 
Engler u. Prantl. under FLacovrriace® (now included in Brxace2). | 
(1) Petals O; flowers in axillary fascicles:—_... .. ¢edxliii—Casearia. 
(IL) Petals present ; flowers in spikes, racemes, or panicles :-- cedxliv---Homalium. 
fIV—TURNERACE A —— 
(1) Characters of the order (q.v. in the Synopsis) :-- nas ... e@dxly—Turnera, 
LVY—PASSIFLORACE A 
(1) Flowers 1-sexual :—- 
(i) Male and female corollas dissimilar; leayes large palmatifid with 
hollow petioles, tafted at the top of the stem, exstipulate ; trees with milky 
juice — - ¢dxlvi—Carica. 
(ii) Male and ‘Eaiamié leprallan similar’: ; aawes small: seattered, palmately 
lobed, or diverse with some’only palmately lobed, usually with largo circular 
glands underneath and also at the top of the petiole, stipulate ; tendrilled 
climbers :— .» ¢dxlvi—Modecca. 
(II) Flowers bisexual ; -tendrilled climbers ; . stipules leafy or filiform :-— 
(i) Calyx tube somewhat short, furnished with a single corona of 1 or 
more rows of filiform threads from the throat :—- pe cedxlix——Passiflora. 
(ii) Calyx tube elongated (somewhat short in T. manicata), furnished 
with ‘2 double corona, one at the throat, the other near the base :— 
. edxlviii-~Tacsonia, 
LVI—DATISCACEA-- 
(1) Characters of the order (q.v- in the Synopsis):— ... -.  cdl—Tetrameles. 
LVII—CACTACHE Ai— 
(I) Stems fleshy, various in form, usually much jointed, joints spheroid, 
prismatoid, flat and leaf-like, and other shapes; leaves reduced to spines often 
in fascicles, or leafless :— 
(i) Armed with spines :— 
(1) Stems, or joints, subglobose or conic, with numerous prominent 
ribs armed at regular distances with fascicles of stiff spines ; flowers in hemis- 
pherie or cylindric heads emerging from a mass of bristly wool and sleuder 
spines ; perianth segments mostly petaloid ; style with 5-rayed stigma :— 
cdli—Melocactus. 
(2) Stems, or joints, mostly angular, or cylindric and ribbed or fluted, 
armed with cushion-like tufts of spines at regular intervals along the ridges or 
angles of the stem ; flowers large, arising from spinous fascicles or indentures 
on angles; calyx-tube funnel-shaped, usually spinous; stameas numerous, 
united only at base, nearly as long as petils ; style slender thread-like, exceeding 
stamens :— aaa cdlii—Cereus. 
(3) Stems, or joints, ‘short, round, “woody, with ‘flat leaf-like branches 
armed with tufts of bristles and spines at more or less regular intervals, from 
which the flowers arise ; perianth mostly petaloid :— 
(A) Tubercles on branches mostly armed with spines (except 
O. vulgaris); perianth widely expanded, rose-like; flowers 
mostly yellow or orange ; stamens numerous free, shorter than 
the-corolia ; and almost as ‘ong as the cylindric style :— 
cdlvi— Opuntia. . 
