Natural Orders.) VI.—MONOCOTYLEDONS. 185 
the nodes, the scales of adjacent nodes alternate; flowers in spikes; 
perianth-segments 1-2, small; stamen solitary; ovary 1-locular, 
2-ovuled; seed solitary, albumen none [p, 183] CXVIII. Casuarinez. 
Y. GYMNOSPERMEZ. 
Leaves or scales undivided, opposite, alternate or in clusters : 
Perianth present in both sexes, of male membranous 9.lobed, of 
female utricular.,........cssesceeceecestnes® CXXII. Gnetacez. 
Perianth absent from the flowers of both sexes ..CXXIII. Conifere. 
Leaves very large pinnatisect, clustered at the apex of the stem; peri- 
anth absent from the flowers of both sexes ..... .CXXIV. Cycadacez. 
VI. weight nt 
*Poerianth 2-seriate th a ne hbk li 
subherbaceous and then with ovary inferior, or if only the inner series 
corolline its segments much larger than those of the outer calycine series ; 
ovary synearpous, rarely (some XyRtDE%), the perianth 1- seriate corolline, 
or (some HyprocnartpE®) 1-seriate nn e and then in aquatic herbs 
with snr 1-locular ovary :—[p. 187] 
Seeds many small, often very minute, without elbumen; ovary inferior 
l-locular with 3 parietal placenta, rarely 3-locular 
Outer perianth-segments calycine, inner eorolline very rarely absent ; 
stamens 3 or 6 or 9, rarely by further multiplication more than 9 or 
re eenge fewer than 3; aquatic plants with regular often 1-sexual 
rei dee. 
be ks a ACE) 
patty perianth-segments corolline like the 
Flowers regular or occasionally slightly pant by enlargement 
of a segment of the outer series; stamens 6 or 3 not united to 
the gyncecium; marsh or land plants, frequently leafless 
CX 
M1. 
Flowers irregular, usually markedly so, from modification of a 
labe 
sessile or nearly sessile anthers......+++-€ 
Seeds conspicuous, with copious albumen :— i 
tOvary inferior or if free or half- i: i (some Haoponace®) then 
terrestrial plants with ovary 3- le both series of perianth- 
segments are corolline and 3-merous ee the embryo is not com- 
pletely enclosed within the albumen :—{p. 186} 
