Classification of Plants 



207 



Class I. — Monocotyledons. 



A. Flowers with marked indefiniteness in the 

 number of flower parts. 

 B. Perianth as a rule absent (Achlamydeous), 

 either as a primitive condition or by 

 loss of perianth formerly present in 

 earlier related types ; when present ill- 

 defined and consisting of bristles or 

 scales. Wind pollinated. 

 C. Stamens and carpels showing great varia- 

 tion in number ; apocarpous, or car- 

 pels more or less joined and at length 

 separating ; 1-4, each i-ovuled; 

 spathe wanting, aquatic or marsh 

 plants. 

 Perianth of bristles, flower spikes on 

 long scapes, staminate above, pistil- 

 late below 



Perianth none, or tubular, or of three or 



six valvate segments ; habit various . 



CC. Stamens usually definite, carpels syn- 



carpous. 



Seed-coat fused with ovary ; leaf sheath 



split, ligule present .... 



Seed-coat free from ovary ; leaf sheath 

 not split, ligule absent 

 BB. Perianth as a rule present, or absent 

 through reduction ; inflorescence sub- 

 tended by bracts ; stamens and carpels 

 as a rule definite ; usually insect pol- 

 linated. 

 Plants with root stock, spathe conspicuous 

 Minute floating plants, spathe incon- 

 spicuous ...... 



AA. Flowers of five whorls prevailing, each whorl 

 usually 3-parted. 

 B. Perianth with sepals and petals similar 



(HOMOCHLAMYDEOUS). 



C. Perianth bracteoid or sepaloid, hypo- 

 gynous. 

 D. Carpels apocarpous, i-seeded, en- 

 dosperm cartilaginous, horny or 

 oily. 

 Dioecious trees with unbranched 

 stems and pinnate leaves 

 DD. Carpels syncarpous. 



Typhace^. 

 Naiadace^. 



Graminace^. 

 Cyperace^. 



Arace^. 

 Lemnace^. 



Palm^. 



