188 LINNJSAN CLASS XIX. 



Carex. Flowers monoecious, rarely dioecious. Stamens usually 8, 

 rarely 1 — 2. Fertile Fl. Perigynium membranaceous, 2-toothed, eraar- 

 ginate or truncate. Stigmas 2 — 3. Achenium lenticular. Cyperacecc, 

 141. 



Scleria. Staminate flowers. Glumes 2 — 6, many-flowered. Paleae 

 without awns. Fertile flowers. Glumes 2 — 6, 1 -flowered. Paleae 

 none. Seeds sub-globose. Cyperacece, 141. 



Tripsacum. Sterile spikelets in pairs, on each joint of the rachis 

 collateral, 2-flowered ; each with 2 paleae. Fertile spikelets solitary, 

 2-flowered. Flowers with 2 paleae; the lower one neutral, upper one 

 fertile Graminacece, 142. 



Comptonia. Sterile florets in cylindrical aments. Scales 1-flowered. 

 Perianth 2-parted. Stamens 3-forked. Fertile florets in globose heada 

 Amentacecc, 115. 



Zea. Staminate flowers in a terminal panicle. Glume 2-flowered, 

 awnless. Pistillate flowers in a lateral compact spike. Style 1, long, 

 filiform. Seed solitary. Graminacece, 142. 



Trayia. Flowers in spikes. Staminal ones with perianth 3-parted. 

 Pistillate flowers perianth 5-parted. Capsules 3-celled, 3-seeded. Eu- 

 phorbiacece, 108. 



Order IV.— TETRANDRIA. 



Eriocaulon. Lachnocaulon. Pcepalanthns. Flowers in dense heads, 

 sterile florets occupying the center. Perianth 4-parted. Fertile florets 

 in the circumference. Perianth 4-parted. Restiacece, 140. 



Alnus. Sterile flowers in a long, cylindrical ament. Scales 3-lobed, 

 3-flowered. Fertile flowers in an ovate ament. Scales 2-flowered. 

 Styles 2. Amentacece, 115. 



Bcehmeria. Sterile flowers with a 4-parted perianth. Fertile flowers 

 with no perianth. Style 1. Nut compressed. Urticacece, 109. 



Urtica. Sterile flowers with a 4-leaved perianth. Stamens 4. Fer- 

 tile flowers with a 2-leaved perianth. Seed 1, shining. Urticacece, 109. 



Parietaria. Flowers surrounded by a many-cleft involucre. Peri- 

 <anth 4-cleft. Seed 1, inclosed by the perianth. Urticacece, 109. 



Morus. Flowers in aments or heads. Perianth usually divided. 

 Fruit a fleshy receptacle covered by numerous achenia. Artocarpa- 

 cece, 111. 



Pachysandra. Flowers in spikes, the upper sterile, the lower fertile. 

 Perianth 4-leaved. Styles 3. Capsule 3-horned, 3-celled, 2 seeds in 

 each cell. Euphorbiacece, 108. 



Order V.— PENTANDRIA. 



Crotonopsis. Flowers in spikes. Perianth 5-parted, with 5 petaloid 

 scales. Stigmas 3, bifid. Capsule 1-seeded, indehiscent. Euphor- 

 biacece, 108. 



Amaranthus. Euzolus. Perianth 2 — 5-leaved. Styles 3. Ovary 1- 

 celled, superior, 1-seeded. Amaranthacece, 99. 



Schizanclra. Sepals and petals confounded, roundish, concave. An« 

 thers connate. Ovaries numerous, on a conical torus, which elongates 

 in maturity. Carpels baccate, 1-seeded, forming a loose spike. Schi 

 tandracece, 4. 



