1716 ARBORETUM AND PRUTICETUM. PART III. 



a large scar at the base: they have 1 cell, and 1, 2, or 3 seeds. — 

 Species tew. Natives of the temperate /one of the northern hemisphere. 

 Leaves alternate, annual, feather-veined, plaited in the bud. (T. Nee* ab 

 Esenbeck Gen. 7*7. Genu. ; Smith Eng. FL t iv. p. 150 — 152.; and obser- 

 vation.) 



( b rm.i > Lm. Flowers unisexual ; those of the two sexes in distinct cat- 

 kins upon the same plant. — Male (lowers in cylindrical catkins. Bracteas 

 somIc, imbricate. Two perigonial scales, that cohere at the base, are 

 adnate to the under surface oi' the bracteal scale. Stamens 8, inserted 

 upon the perigonial scales towards their base, and in about the line of their 

 cohesion. Anthers bearded at the tip of one cell. — Female flowers in a 

 bud-like catkin, which is developed into a branehlet : the flowers are borne 

 at its tip. Bracteal scales ovate, entire. Ovaries many, very minute; 

 grouped ; each invested with minute, lacerated, villous, involucral scales, 

 that cohere at the base; having 2 cells, each including 1 ovule, and this 

 apparently erect when young, pendulous when adult. Calyx not obvious; 

 formed of a slightly villous membrane, that covers the ovary to the tip, and, 

 as the ovary progresses to a nut, adheres to it most closely, and becomes 

 part of the shell. Stigmas 2, long, thread-shaped. — Fruit. Nut ovate ; 

 included in a large, leafy, tubular involucre, that is lacerate at the tip ; 

 without valves, or, very rarely, with 2; scarred at the base; by abortion, 

 1-seeded. Seed adhering to the remains of the dissepiment. — Species 

 few. Large shrubs and trees, occurring in the colder zones of the 

 northern hemisphere. Leaves alternate, entire, feather-veined. Flowers 

 protruded before the leaves. (T. Nees ab Esenbeck Gen. PL El. Germ. y and 

 observation.) 



cVrimnus Town. Flowers unisexual ; those of the two sexes in distinct 

 catkins upon one plant. — Male flowers. The catkin lateral, sessile, cylin- 

 drical. The bracteas imbricate. The flower consists of 12 or more sta- 

 mens, inserted at the base of a bractea. Anthers bearded at the tip, 1- 

 eelled. — Female flowers in lax terminal catkins. Bracteas of 2 kinds, 

 outer and inner : outer bracteas entire, soon falling off; inner bracteas 

 in pairs, each 3-lobed, with the side lobes much the smaller, forming an 

 involucre about an ovary. Calyx clothing the ovary to near its tip, and 

 adhering to it ; toothed at the tip. Ovary with 2 cells, an ovule in each ; 

 the ovule early pendulous : one of them becomes abortive. Style very 

 short. Stigmas 2, long, thread-shaped. — Fruit. Nut attended by the 

 involucre, and ovate, compressed, ribbed, clothed except at the base, and 

 tipped with the adnate thin calyx; woody; including one seed. -^-Species 

 about .'J. Natives of Europe, the Levant, and North America. Leaves 

 alternate, annual, feather- veined, plaited in the bud. (T. Nees ab Esenbeck 

 Gen. PI. /•'/. Germ. TUmtr.) 



CAtkv \ Mirliv. Flowers unisexual ; those of the two sexes in distinct cat- 

 kins upon the same plant. — Male flowers. The bracteas of the catkin 

 simple, imbricate. Flower of 12 or more stamens, inserted at the base 

 of a bractea; filaments branched, each branch bearing an anther; anthers 

 each of l cell. — Female flowers. Bracteas small, deciduous. Involucral 

 in pairs, hairy at the base, the pair growing together at their opposed 

 id constituting an inflated covering to the ovary, which it conceals. 

 Gfuyi investing the whole (nary, and extended at the tip into a very short 

 ciliafe tube. Ovary having two cells, and 1 ovule in each. Style short. 

 oai 2, long, thread-shaped. — Fruit a nut, minute, ovate, even ; bearded 



at me tip ; L-seeded from abortion; covered by an inflated, nerved, inein- 



branoui involucre. The fruits of a catkin imbricately disposed into an 



nikc —Species few. Trees, natives of the temperate /ones of both 

 hemispheres. Leaves alternate, annual, feather-veined. (T. Nccs ab Escn- 

 beek, tu I I ion. ) 



