190 LINN^EAN CLASS XX. 



Order IV— TETRANDRIA. 



Myrica. Flowers in aments. Scales crescent-shaped. Anthers 4- 

 valved. Fertile flowers. Stigmas 2. Drupe 1-celled, 1-seeded. 

 Amentaccte, 115. 



Viscum. Sterile florets, with calyx 3 — 4-parted. Segments trian- 

 gular, erect. Anthers many-celled, opening by pores. Fertile flowers. 

 Calyx obsolete. Petals 3 — 4, coriaceous. Fruit baccate, 1-celled, 1- 

 seeded. Loranthaccce, 64. 



Madura. Calyx and corolla none. Style 1, filiform, villous. Car 

 pels numerous, uniting into a dense globose head, fleshy. Seeds ovate, 

 compressed. (Osage Orange.) Artocarpacece, 111. 



Order V.— PENTANDRIA. 



Nyssa. Staminate flowers. Perianth 5-parted. Stamens 5 — 10. 

 Pistillate flowers. Perianth 5-parted. Style 1. Drupe inferior, 1- 

 seeded. (Trees.) Santalacece, 105. 



Hamiltonia. Perianth turbinate, campanulate, 5-cleft. Stamens 5. 

 Stigmas 2 — 3. Drupe inferior, 1-seeded. (Shrub.) Santalaceai, 105. 



Zanthoxylum. Staminate flowers. Calyx 5-parted. Corolla none. 

 Stamens 3 — 8. Pistillate flowers. Styles 2 — 5. Carpels crustaceous, 

 2-valved, 1 — 2-seeded. Zanthoxylacece, 28. 



Cannabis. Staminate flowers. Calyx 5-parted. Stamens 5. Fertile 

 flowers. Perianth oblong, acuminate, convolute ; the base ventricose, in- 

 cluding the ovary. Stigmas 2, long, subulate. JS"ut 2-valved. (Hemp.) 

 Urticacew, 109. 



Acnida. Sterile florets, with the perianth 5-parted. Stamens 5. 

 Fertile florets, with the perianth 3-parted. Stigmas 3 — 5, sessile. 

 Fruit 1-seeded. Chenopodiacece, 100. 



Humulus. Sterile florets, with the perianth 5-parted. Anthers 

 with 2 pores. Fertile florets in aments, with large scales. Perianth 

 none. Urticacece, 109. 



Irisine. Sterile florets, with a double perianth, exterior ones 2 — 3- 

 leaved ; the interior 5-leaved, petaloid. Fertile florets, with the inner 

 perianth surrounded by long hair. Capsule ovate, 1-celled, 1-seeded. 

 Amaranthacect, 99. 



Negundo. Calyx minute, unequally 4 — 5-toothed. Petals none. 

 Anthers 4 — 5, linear, sessile. (Ash-leaved Maple.) Aceracece, 38. 



Uarbya. Perianth simple, turbinate, 4 — 5-cleft to the middle. 

 Lobes ovate, spreading. Stamens 4 — 5, arising from the disk, opposite 

 the lobes of the perianth. (Small shrub.) Santalaceai, 105. 



Order VI.— HEXANDRIA. 



Smilaz. Perianth campanulate, spreading, 6-parted, petaloid ; 3 

 styles. Fruit baccate, globose, 3-celled. (Mostly twining plants.) 

 Stnilacca>, 119. 



Dioscorea. Perianth superior, 6-cleft. Ovary 3-celled, 1 — 2 ovules 

 in each cell. Fruit a thin compressed capsule. (Twining plants.) 

 Dioscoreacea; 118. 



Gleditschia. Calyx consisting of 3 — 8 sepals, united at the base. 

 Petals equal in number to the sepals. Legume large, compressed. 

 (Trees.) Legxwiinosce, 43. 



