KEY TO SUB-CLASSES, ORDERS AND GENERA. 197 
CXXV—ARACE Ai—cont. 
(II) Flowers hermaphrodite (rarely a few 1-sexual); spadix without append- 
age ; leaves distichous, petiole jointed at apex ; epiphytic climbers :— 
(i) Perianth none :-- . 
(1) Flowers wholely bisexual :—- 
(A) Ovary l-celled, ovule; bosal; berries free ; leaves entire, ovate, 
elliptic-ovate or suborbicular, caudate, sometimes cordate :— 
mxxvi—-Scindapsus. 
(B) Ovary l-celled, ovules 1—3; berries confluent; leayes entire 
oblong-cordate, or else entire when young and pinnatifid or 
pinnatisect with falcate truncate segments when old, but 
always with large perforations along the region of the 
midrib :—~ & baa i nh mxxviii— E pipremnum. 
(C) Ovary 1--2-celled, ovules many; berries confluent ; leaves when 
young entire ovate and when old perforate or pinnatifid below 
the middle :— he aes wae .. mxxvii-—Rbaphidophora. 
(2) Flowers hermaphrodite above and female only below along the spadix ; 
Ovary l-celled, ovules 1—3; berries confluent; leaves entire or perforated with 
lobes when young and pinnatisect tv more than half way down with acuminate 
faleate lobes when old:— _.... AC ay se v3 tt mxxix——Monstera. 
(ii) Perianth of 4—6-segments ; Ovary 1—3-celled, ovule 1 on the inner 
angle of the cell; leaves entire with either a broad fiat truncate petiole and 
short entire sheath, or a very short petiole with semi-amplexicarel base and no 
sheath :— ia “ Ba tee coe ae sb ee +» mxxx—Pothos, 
CXXVI—GRAMINACEA— 
(1) Mature spikelets separating entirely from their pedicels or falling with 
them, spikelets similar or differing in sex and structure, perfect spikelets with 2 
heteromorphous spikelets, the upper hermaphrodite, the lower male or barren ; 
rachilla not continued above the upper floret :— 
(i) Spikelets usually in continuous spikes, racemes or panicles; glumes 
herbaceous or membranous, the lower smaller (sometimes very small or sup- 
pressed) ; lower flowering glume generally resembling the outer glumes in struc- 
ture and nervation, the upper firmer and at length rigid, often papery to 
crustacedus, awnless or rarely mucronate :— ~ 
(1) Flowers dicecious ; inflorescence of large terminal globose bracteate 
heads with radiating spikes, males with many, females with one, spikelet in each 
spike ; leaves long, rigid, spine-tipped, glaucous, involute; gregarious, much 
branched, rigid, littoral bashes: -— aes Bol Pe sas ... moxxxii—Spinifex. 
(2) Flowers not divecious :— 
(A) Spikelets 2-flowered, upper bisexual, lower male or neuter, mature 
falling entire and singly from the tips of their pedicels, 
not subtended by bristles; branches of panicle not produced 
beyond the uppermost spikelets; spikelets very numerous and 
small, crowded on the capillary branches of a very large 
panicle; glumes 4, all very minute; leaves broad, flat; stem 
solid; large glabrous grass :-— .. mxzxi—Thysanolena. 
(ii) Spikélets usually in pairs, one cessile, the other pedicelled, or the 
terminal ternate or solitary, on the axis of usually a spike-like raceme ; outer 
glumes more cr less rigid and firmer than the flowering glumes, the lower always 
longer than the florets; flowering glumes membranous (often hyaline), that of 
the upper floret often awned or reduced to an awn :— 
(1) Panicle spiciform, or cylindric thyrsus, silvery silky, 1 flowered, not 
awned; leaves narrow; stem leafy, with solid internodes; erect perennial 
grass:— .., re 2p rest ees Lie ay: iF mxxxlii—I mperata. 
(2) Panicle a nodding fan-shaped corymb, 2-flowered, awned; leaves 
narrow ; stem as thick as a goose-quill; tall perennial grass:— mxxxiv—Miscanthus. 
(3) Panicle much branched, open, silky, with fragile rachis, spikes 
awoless ; leaves narrow, flat; tall perennial grass:— _ _... ... mxxxiv—Saccharum. 
(Il) Mature spikelets breaking up, leaving the persistent (or sub-persistent) 
glumes on the pedicel ; or if falling entire, the not composed of two heteromor- 
phous florets :— 
(i) Leaf blades not transversely veined, and not articulated on to the 
sheath; spikelets not inserted in notches or pits of a simple rachis, panicled, 2- 
or more-flowered :— , 
