Division I. APETAL#, INCOMPLETA, or MONOCHLAMYDEZ. ‘ 
-bilocular ; stigmas one or two; ovule solitary, micropyle always ,_ 
aa or scales; ovary uni- or bi-locular; seed without 
374° °s sos: and Physiological Botany. 
/ 
[Dicotyledons are subdivideds as nee iets — 
i 
Perianth consisting of only a single whorl of leaves, or entirely 
absent, or occastonally of a double whorl of sepatlotd leaves. 
SUBDIVISION I. Ovary superior ; perianth usually distinct. 
Cohort I. CHENOPODIALES. Flowers usually hermaphrodite; peri- 
anth green or coloured, usually regular, sometimes in two whorls, tube 
short or absent, segments imbricate in bud ; ovary of one, rarely several 
carpels ; ovules solitary, rarely two or more, basal ; embryo usually | 
coiled or curved. Herbs or shrubs. This cohort includes the orders — 
Phytolaccacee (Phytolacca) ; Polygonacee (Eriogonum, Polygonum, Fago- 
pyrum, Rheum, Rumex); Amaranthacee (Amaranthus, Celosta) ; 
Chenopodiacee (Beta, Chenopodium, Atriplex, Spinacta, Salicornia, 
Salsola); and Nyctaginee (Mirabilis, Businvillea). } 
Cohort II. LAURALES. Flowers usually unisexual ; perianth green 
-or coloured, usually regular ; ovary unilocular ; stigma one ; ovule 
solitary; embryo straight, with or without endosperm. Mostly aromatic 
trees or shrubs; almost entirely tropical. Orders :—Monimiacee 
(onemia, Laurelia); Myristicacee (Myristica) ; Lauracee (Cinna- 
monum, Persea, Sassafras, Laurus, Cassytha, Canephora, Neca” va) 
Oreodaphne). io 
Cohort III. DAPHNALES. Flowers usually hermaphrodite ; peri- | 
anth green or coloured, regular or irregular, oftem tubular ; ovary uni- 
locular, rarely bilocular ; stigma one; ovule usually solitary, pendu- 
lous or suberect ; embryo straight, with no or very little endosperm. 
Trees or shrubs, mostly tropical or southern. Principal orders:— 
Thymeleacee (Daphne, Pimelea); Eleagnacee (Hippophaé, Eleagnus); —~ 
Proteacee (Leucodendron, Grevillea, Banksia, Protea, Vakea). ‘el 
Cohort IV. URTICALES. Flowers diclinous, or less often polyga- 1 
mous or hermaphrodite ; perianth green, usually regular, rarely absent; 
stamens opposite the perianth-lobes or sepals ; ovary unilocular, rarely 
superior ; fruit usually an achene or samara ; embryo straight, with or — 
without endosperm. Principal orders :— Urtscacee (Urtica, Behmeria, . 
farietaria); Moracee (Artocerpus, Ficus, Dorstenia, Morus, ee” i 
Cannabrnee (Cannabis, HLumulus); Ulmacee (Ulmus). tp itd sua 
Cohort V. AMENTALES. Flowers dichinous, in catkins, cones, or. ‘ie 
heads; perianth absent or sepaloid, or of one or more bristles, bracts, 
sperm. Trees or shrubs, with alternate, simple, usually stipulate 1 
