l02 48. MYRICACEAE — 49. JUGLANDACEAE — 50. BETUI.ACEAE 



ORDER MYRICALES 



FAMILY 48. MYRICACEAE 



Trees shrubs or iindershrubs. Leaves undivided, without stipules. Flowers 

 in simple or compound spikes, unisexual, without a perianth, but usually with 

 2 — 6 bracteoles. Stamens 2 — 12, usually 4. Anthers opening by two longi- 

 tudinal slits. Ovary i-celled. Ovule i, erect, straight. Styles 2, united 

 at the base, thread-shaped, stigmatose on the inside. Fruit a drupe. Seed 

 with a thin coat and a straight embryo, without albumen. (Plate 29.) 



Genus i, species 25. Tropical and South Africa, Canary Islands, Azores. 

 They yield bark for tanning, wax, and edible fruits, and are also used 

 in medicine Myrica L. 



ORDER JUGLANDALES 

 FAMILY 49. JUGLANDACEAE 



Trees. Leaves alternate, unequally pinnate, without stipules. Flowers 

 in spikes or catkins, monoecious, with bracteoles which are adnate to the 

 ovary in the female flowers. Perianth 3 — 4-parted. Stamens nimierous. 

 Anthers opening by two longitudinal slits. Ovary inferior, i-celled. Ovule 

 I, basal, straight. Styles 2, united at the base, stigmatose lengthwise. Fruit 

 a drupe with an incompletely septate stone. Seed lobed, with a thin coat, 

 without albumen. 



Genus i, species 2. Cultivated in North Africa. They yield timber, tans and 

 dyes, edible fruits (walnuts), oil, sugar, and medicaments. Juglans L. 



ORDER FAGALES 



FAMILY 50. BETULACEAE 



Trees or shrubs. Leaves alternate, undivided, stipulate. Flowers monoe- 

 cious, in spikes or catkins, with a perianth of bract-like segments or without 

 a perianth. Stamens 4. Ovary 2-celled at the base. Ovules solitary in each 

 cell, descending, inverted. Styles 2. Fruit a nut. Seed i, exalbuminous, 

 with a membranous coat. — Genera 2, species 2. Extra-tropical regions. 

 (Under CUPULI FERAE.) 



Male flowers without a perianth, with 2-partcd filaments and hairy anthers. 

 Female flowers with a small perianth and a jagged involucre free from 

 the bract but adnate to the fruit. Fruit large. Female spikes bud- 

 shaped, soUtary. Leaves folded at the mid-rib in the bud. — Species i 

 (C. Avellana L., hazel). Cultivated and naturalized in North-wc^t 

 Africa. Fruits edible. [Tribe CORYLEAE.] . . Corylus Tourn . 

 Male flowers with a 4-parted perianth, simple filaments, and glabrous anthers. 

 Female flowers without a perianth, enclosed by a 5-parted involucre 

 formed by the connate bracts and bracteoles. Fruit small. Female 

 spikes cone-shaped, at length woody, arranged in racemes. Leaves 



