ANALYTICAL KEY TO THE FAMILIES DESCRIBED 
IN THIS FLORA 
Class I. Monocotyledons. 
Flowers usually with their parts in threes or sixes, never in fives. 
Leaves mostly parallel-veined. Embryo with a single cotyledon. 
I Perianth free from the ovary or wanting. 
A. Perianth wanting, or of scale-like or bristle-form divisions. 
1. ARACEAE. 1 
B. Perianth present, herbaceous or colored, never scale-like nor 
bristle-form. 
la. Stamens all alike and fertile. 
2a. Flowers perfect; plants not climbing. 
3a. Divisions of the perianth alike or nearly so. 
4a. Styles united, often short, or rarely wanting. 
5a. Plants with bulbs, corms, erect rootstocks, or 
caudices, or bundles of fleshy roots. 
4. LILIACE^E. 5 
5b. Plants with elongated horizontal rootstocks. 
5. CONVALLARIACEAE. 9 
4b. Styles distinct. 3. MELANTHACEiE. 4 
3b. Divisions of the perianth unlike (3 green sepals and 3 
colored petals) ; leaves linear and the flowers in umbels. 
2. COMMELINACE^E. 2 
2b. Flowers dioecious; plants scrambling or climbing. 
6. SMILACEZE. 10 
lb. Stamens unlike,- or only 3 with fertile anthers. 
2. CO MMELINA CEZE. 
II. Perianth present, adnate to the ovary. 
Stamens 6. 7. AMARYLLIDACEiE. 12 
Stamens 3; leaves 2-ranked, equitant. 
8. IRIDACEZE. 14 
Class II. Dicotyledons. 
Flowers usually with their parts in fives or fours. Leaves 
mostly netted-veined. Embryo with two cotyledons. 
I. Corolla when present choripetalous (petals distinct) ; per¬ 
ianth none, or of similar segments or divided into calyx and corolla ; 
sepals, petals, and stamens sometimes on a disk or hypanthium. 
A. Calyx and corolla both present, calyx may be minute. 
la. Flowers hypogynous or perigynous; ovary free from the calyx. 
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