Natural Orders. } VI.—MONOCOTYLEDONS. 187 
erianth-segments of both series present and isomerous :— 
Perianth-segments 2-merous ; stamens 4; ovary 1-locular 
CXXXV. Roxburghiacex 
Perianth-segments 3-merous; stamens 6 or 3 :— 
Terrestrial plants of very various habit; embryo small, 
shorter than and completely enclosed within the albumen ; 
inflorescence very various, axillary or terminal, but never 
on a l-leafed scape .......6ss0eeee: CXXXVI. Liliacezx. 
Aquatic erect or floating herbs; embryo cylindric, as long 
as anand lying within a central canal in the albumen; inflor- 
or spicate, pica a 1-leafed sca 
CXXXVII. Pontederiacez. 
Perianth of the outer series either a Inge solitary segmen 
embracing the inner 3-merous series, or else absent; flowers 
small solitary axillary in the fantier bracts of a terminal 
capitulum CXXXVIII. Xyridez. 
= 1p 
{Outer series of perian 
embryo marginal or oni —— colonel within the albumen 
[p. 186] ‘ 
*Perianth if 2-seriate with the segments of i pe series calycine or if 
those of the inner series corolline then not larger. than those of the 
outer series or perianth 1-seriate calycine—and then either in terrestrial 
r in aquatic herbs with apocarpous or solitary carpels,—or 
§Perianth regularly 2- étiue segments of each series 3-merous; ovary 
synearpous with albuminous seeds, or if ovary apocarpous and seeds 
Without albumen Prairie then erect scapigerous herbs with con- 
spicuous whorled paniculate or umbellate flowers :—(p.1 
IP th with segments of both series calycine rigid or herbaceous, 
rarely (some Juncacex) the segments of inner series petaloid but 
then not a = those of the outer; ovary syncarpous; albumen 
copious :—[p. 
Fruit a 3- nar capsule; grassy herbs with slender linear or 
terete leaves, or with leaves reduced to scales; embryo enclosed 
within the albumen ......--s+++++ese000" Juncacez. 
Fruit indehiscent ; shrubs or trees with fattened leaves; embryo 
not enclosed within the albumen :— 
near the hilum {p. 188) eee) * 
