30 Introduction to Botany. 



2. Salix amygdaloides, Anders. (Gr., amygdale, an almond; eidos, form.) 

 PEACH-LEAVED WILLOW. Stamens more than 2 ; with pubescent filaments ; cap- 

 sule acutely and narrowly ovoid, about as long as the pedicel; leaves slender- 

 petioled, broadly lanceolate with long acuminate apex ; dark green above and paler 

 and somewhat glaucous beneath. Stipules fugacious. Along streams, etc. 



3. Salix lucida, Muhl. (L., lucidus, bright.) SHINING or GLOSSY WILLOW. 

 Stamens 5, the filaments pubescent near their bases. Capsules longer than the 

 pedicels and narrowly ovoid. Leaves ovate to lanceolate, long acuminate, serrulate 

 on the border, green and shining on both surfaces. Stipules glandular and nearly 

 cordate to oblong. 



4. Salix longifolia, Muhl. (L., longus, long ; folium, leaf.) SANDBAR or RIVER- 

 BANK WILLOW. Stamens 2 with pubescent filaments. Capsules ovoid or conical, 

 glabrous or silken. Leaves linear-lanceolate or linear-oblong, acuminate, and 

 sparingly denticulate. Stipules small or none. Generally a much-branched shrub. 

 Occurring in thickets along lakes and water courses. 



5. Salix Missouriensis, Bebb. MISSOURI WILLOW. Stamens 2 with glabrous 

 filaments. Glabrous capsules narrowly ovoid, and 3 or 4 times longer than the 

 pedicels. Leaves lanceolate to oblanceolate, acuminate, finely serrate, with minute 

 glands on the teeth, green above and pale or glaucous beneath. Stipules about inch 

 long. Becoming tall trees with thin gray bark. Along river banks. 



CUPULIFERJE. OAK FAMILY. 



Trees or shrubs with monoecious flowers, the staminate flowers in 

 aments or clustered ; the pistillate flowers either solitary or clustered or 

 in catkins. Fruit a I -celled and I -seeded nut, with or without an in- 

 volucre. Ovary 2-7-celled with 1-2 ovules in each cell, but becoming 

 reduced in number in the fruit. 



I. BETULA. Birch. 



(The ancient Latin name.) 



Trees or shrubs. Flowers of both kinds in aments, expanding before 

 or with the leaves. Staminate flowers in clusters of threes in the axil 

 of each bract of the ament, each flower consisting of two 2-parted fila- 

 ments bearing i anther sac on each fork. Pistillate flowers from i to 3 

 in the axil of each bract, without a perianth. Ovary 2-celled and styles 2. 

 Fruit becoming a small, compressed, laterally winged nut. Leaves thin 

 and dentate or serrate. 



i. Betula papyrifera, Marsh. (Gr., papyros, papyrus rush ; L., ferre, to bear.) 

 PAPER or CANOE BIRCH. Trees with chalky-white bark. Leaves ovate and finely 

 dentate, smooth and green above, and glandular and pubescent on the veins beneath. 



