76 SAPINDACEiE. 



elongated. Fruit a double samara, the two 1-seeded parts separating at 

 maturity, each long- winged. Cotyledons large and thin. 



* Leaves simple ; trees not diucious. — Acee proper. 



1. A. inacropliylluin, Pursh, Fl. i. 267 (1814) ; Hook. Fl. i. 112. t. 38 ; 

 Nutt. Sylva, ii. 77. t. 67. Tree 50—90. ft. high, 2~3 ft. in diameter : 

 leaves }£ — 1 ft. broad, deeply 5-lobed, the sinuses rounded, the segments 

 often 3-lobed, coarsely toothed : fl. large, in large crowded pendulous 

 racemes which appear with the unfolding leaves, greenish yellow or 

 reddish : stamens 9 or 10 ; filaments hairy : fruit densely hirsute or 

 almost hispid, the glabrous wings 1 in. long or more, divergent. — Along 

 mountain streams or on hillsides throughout the Coast Range ; also in 

 the middle Sierra, where it is taller, more slender, and with a harder wood 

 than in the Coast Range. A good quality of maple sugar has been made 

 from the mountain form. The wood is white and susceptible of a fine 

 polish. The young twigs when cut exiide a milky juice. 



2. A. glabrum, Torr. Ann. Lye. N. Y. ii. 172 (1828) : A. tripariitnm, 

 Nutt. in T. & a Fl. i. 247 (1888). Shrub 8—15 ft. high, glabrous, slen- 

 der : leaves 2 — 4 in. broad, roimd cordate in outline, laciniately 3 5- 

 lobed, or sometimes completely 3-foliolate ; the lobes or leaflets doubly 

 serrate, the teeth very acute : fl. corymbose on short 2-leaved branchlets : 

 sepals and petals greenish, linear, 2 — 3 lines long : filaments glabrous : 

 fruit with slightly spreading wings 1 in. long or less. — From Yosemite 

 northward in the Sierra. Only a bush in California, but often a small tree 

 in more northerly regions. 



* * Leaves unequally pintiate ; tree d i a cious. —Genim Negundo, Moeuch. 



3. A. Californicuiii, Greene. T. & G. Fl. i. 250 & 684 (1838), under 

 Negundo ; H. & A. Bot. Beech. 327. t. 77 ; Nutt. Sylv. ii. 90. t. 72. Tree 

 30—70 ft. high, the young twigs and partly developed leaves villous- 

 canescent : leaflets 3, ovate, or the lateral ones oblong, acute, 3 — 4 in. 

 long, the terminal largest and 3—5 lobed, or coarsely serrate : fl. of 

 sterile tree umbellately clustered, the pedicels long and capillary, those 

 of the fertile in drooping racemes : fruit pubescent l—\%_ in. long, 

 including the nearly erect wings. — In the Coast Ranges from San Luis 

 Obispo northward. Often planted for shade, along with the very distinct 

 A. Negundo of the Atlantic slope. 



3. .ESCULUS, Linnxus (Buckeye. Horse-Chestnut). Trees with 

 opposite palmately compound exstipulate leaves, and a large thyreoid 

 inflorescence, the flowers on jointed pedicels. Flowers polygamous. 

 Calyx tubular, unequally 5-toothed. Petals 4 or 5, unguiculate. Stamens 

 5-8, exserted, often unequal. Ovary 3-celled : ovules 2 in each cell, 1 

 abortive. Fruit a large coriaceous 3-valved capsule. Seed very large ; 



