b KEY TO SEED PLAN1>;. 



Flowers (in ours) pedicellate, in paniculate clusters, or subsessile 

 in dense capitate heads; periantli of 6 distinct dry segments; 

 leaves terete or flat; fruit a capsule. . Jtjncaoe^, p. 92. 



B. Flowers on a spadix or spike, the whole cluster often enclosed by 

 a spathe or foliaceous or membranaceous bract; perianth none or 

 not petal-like. 



Subaquatic reed-like plants; flowers unisexual, borne in a dense 



cylindrical spike or globose head, without distinct perianth . 



TTPHACEiK, p. 95. 

 Small or minute leafless aquatics, the stems represented by leaf-like 



floating fronds LbmnacBjB, p. 97. 



Aquatic plants; flowers naked or with a very small calyx, perfect 



or unisexual; stamens 1 to 4 . . . . NAiADACBiB, p. 99. 

 Marsh or subaquatic plants; flowers perfect, with or without 



perianth; stamens 6 or 1 JuNCAQiNACBiE, p. 102. 



C. Flowers with a more or less corolla-like perianth. 



Ovaries several, distinct, becoming achenes in fruit; perianth of .3 

 sepals and 3 petals. . . . ALiSMAOEiB, p. 104. 



Ovary 1 and 



Superior; perianth regular, petal-like; stamens 6, sometimes 

 3 or 4 . . . ... . LiLiACEiB, p. 106. 



Inferior. 



Perianth regular; stamens 3 Ikidacb^b, p. 128. 



Perianth irregular; stamens 1, rarely 2.0rchidac'E/e, p. 130. 



CLASS 2 —DICOTYLEDONS. 



Leaves netted-velned; parts of the flower mostly in 4's or o's; vascu- 

 lar bundles in a ring around a central pith, the stem when 

 perennial increasing in girth by annual layers; embryo with 2 

 cotyledons. 



I. APETALOUS DIVISION. Corolla none- calyx present, .some- 

 times petal-like, rarely none. 



A. Flowkks moncecious ok dicbcious, oke or both kixps in 



AMENTS; TREES OR SHRUBS. 



Leaves simple and 

 Opposite; flower dioecious, 1 tu ;! in each axil of the connate bracts; 

 sepals of staminate flowers 4, of pistillate flower 2 or none 



G-ARRYACBiB, p. 362. 



Alternate. 



Both kinds of flowers in anients. 



Flowei's 1 to each scale or bract; perianth none. 



Fruit a 1-celled many-seeded capsule; seeds with a coma; 



flowers difficious. ... . Salicace.e, p. 135. 



Fruit a waxy-coated berry; flowers monoecious or dioecious. 



Myric.vob^b, p. 146. 

 Flowers 2 or 3 to each scale or bract; staminate ament long 

 pendulous; pistillate small, maturing into a woody cone 

 containing margined achenes. . . BETULAOBiE, p. 139. 



