56 SPRING FLORA 



1. A. platanoides L. Norway Maple. A round-topped tree 

 with branches that exude a milky juice when broken. Leaves 

 "bright-green; 3-7-lobed and sharply much -toothed. Flowers 

 monoecious, appearing with or before the leaves on the sea- 

 son's growth; yellowish-green and conspicuous; from quite 

 large terminal buds, the scales of which enlarge and form a 

 conspicuous involucre to the umbel-like corymb. Disk con- 

 spicuous. Samaras large, dark-brown, strongly-veined, with 

 wide-spreading Avings; truncate where they touch each other; 

 dropping off in the autumn. April. Growing only in culti- 

 vation. 



2. A. Pseudo-platanus L. Sycamore Maple. A medium-sized 

 tree with rather large, deeply 3-5-lobed leaves. Flowers from 

 terminal buds, polygamous, appearing after the leaves; green- 

 ish-yellow, in terminal., drooping, compound racemes, the lower- 

 most flowers of the raceme being fertile. Stamens 8; filaments 

 hairy. Ovaries very woolly. Samaras woolly on the inside 

 around the seeds; remaining on the tree until the following 

 spring. May-June. In cultivation only. 



3. A. glabrum Torr. Mountain Maple. A slender-branched 

 shrub or small tree with gray branches and reddish twigs, 

 often growing in clumps. Leaves small (the largest scarcely 

 exceeding 2 inches in length and slightly more in width); not 

 leathery; 3 (or 5) lobed to divided, the lobes or divisions with 

 many unequal coarse and sharp teeth. Petioles, peduncles and 

 the fruit-wings often red on the upper surface. Flowers few; 

 polygamous; in peduncled, nodding, umbel-like corymbs. Sta- 

 mens 8. Fruit % inch long or less; wings broad. April-May. 

 5.000-9,000 ft. 



4. A. grandidentatum Nutt. Shrubby Maple. Shrub or small 

 tree, somewhat larger than No. 3. Leaves strongly netted- 

 veined; somewhat leathery; the largest 3 inches in diameter: 

 3-lobed. or 5-lobed with the 2 lowermost lobes scarcely more 

 than teeth and the 3 upper ones coarsely and bluntly 3-5 

 toothed at apex, their sides entire or sinuate. Flowers both 

 from axillary and terminal buds; monoecious or polygamous; on 

 long, hairy pedicels, in nearly sessile, drooping, umbel-like 

 corymbs. Disk hairy. Stamens 8, long; wings narrow. Along 

 streams and in rich soil on foothills, often forming copses. 

 March-May. 4,500-6,000 ft. 



5. A. saocliarimim L. (A. dasycarpum Ehrh.) White, Soft 

 or Silver Maple. A large tree often reaching a height of 100 

 ft. or more; bark flaky. Leaves silvery-white beneath; deeply 

 5-lobed, the lobes and sinuses acute. Flowers on short pedicels; 

 in lateral, umbel-like corymbs. Stamens 3-6. Fruit woolly 

 when young; falling the last of April or the first of May. Cul- 

 tivated. March. 



6. A. Negumlo JL,. (Negundo aceroides Moench.) Box Elder 

 or Ash-leaved Maple. A tree sometimes approaching a height 

 of 80 ft. Young branches often purplish-red with a white 

 bloom. Leaves petioled; pinnately 3-5 foliate; leaflets toothed 

 or lobed, ovate, veiny, pubescent when young but at length 

 glabrous. Disk none. Flowers from mixed axillary buds (sta- 

 minate flowers from accessory buds also); dioecious; apetalous; 

 greenish; on long, drooping stems; appearing before the leaves; 

 staminate flowers in umbels, the pistillate in drooping racemes. 

 Stamens 4-5, with reddish subsessile anthers. Cultivated and 

 along streams. March-April. 



