ANALYTICAL KEY. XV 



13. Flowers unisexual, at least the staminate in aments. Trees or shrubs with 



alternate leaves. 

 Monoecious : male flowers in- aments ; female solitary or few : 

 ovary inferior : leaves simple, with caducous stipules. 

 Anthers 2-celled : nut in- a cup-like or spiny involucre. Cupulifbe^;, 74 

 Anther cells separate : nut in a foliaceous or tubular invo- 

 lucre Corylus in Cupulifer^;, 74 



Monoecious or dioecious, flowers all in aments : ovary superior. 

 Fruit a 1 -seeded nutlet : bracts thickened and rigid in fruit : 



nut winged or angled. . . . Betuleae, in CuPULiFERiE, 74 



Fruit a many-seeded capsule : dioecious : bracts herbaceous : 



seeds comose. Salicaceje, 75 



Subclass II. MONOCOTYLEDONS. Embryo with a single 

 cotyledon. Leaves mostly parallel-veined. Flowers usually 3-merous, 

 never in fives. Mostly herbaceous. 



A. Ovary inferior: perianth conspicuous, colored : terrestrial: flowers perfect. 

 Flowers irregular : stamens and style coherent ; anthers 1 or 2 : 



leaves alternate, sheathing Orchidace.ss, 76 



Flowers regular : stamens 3, perigynous : leaves equitant. . Iridacb^!, 77 

 Flowers regular : stamens 6, perigynous : leaves not equitant. 



Amaryllidaceje, 78 



S3. Ovary superior or nearly so: perianth regular or none. 

 Carpels united into a compound ovary : perianth corolla-like, 

 rarely partly herbaceous : terrestrial plants. 

 Woody climber, with tendrils : anthers 1-celled. . . Saiilace^e, 80 

 Herbs : anthers 2-celled. 



Perianth mostly of similarly colored lobes or divisions : 



stems from a bulb, corm, or rhizome. . . . Liliace^!, 79 

 Perianth of 3 green sepals, and 3 ephemeral deliquescent 



petals : stems from fibrous roots. . . Commelin.iCE.si, 81 



Carpels distinct or solitary : aquatic or marsh herbs. 

 Perianth none : seed albuminous : fruit utricular or nut-like. 

 Flowers monoecious in heads or on a crowded spadix : 



leaves linear. Typhaceje, 83 



Small floating disk-like plants. .... Lemnace^;, 84 



Perianth herbaceous, petaloid, or none t albumen none. 



Carpels few : perianth none or in fertile flowers herbaceous. 



Naiadaoeje, 86 

 Carpels numerous in a whorl or head : 3 sepals herbaceous, 



3 petaloid. Alismace^;, 85 



Perianth of 6 similar glumaceous segments : capsule 3-valved. 



Bushes or sedge-like JtTNCACEa;, 82 



Flowers in the axils of scales or glumes, spicate, without evi- 

 dent perianth. Stems solid : sheaths closed : scales single : 



anthers basifixed CYFERACEiE, 87 



Culms hollow, terete : sheaths split : glumes in pairs : anthers 



versatile. Gra miners. 88 



