200 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



96. STAPHYLEACEAE. Bladdernut Family. 



1. STAPH YIEA L. 

 1. Staphylea trifolia L. n 



Moist woods. Apr.-May. Eastern U. S. Bladdernut. 



J^'ZT** 1 AemiUs ^ the Aesculaceae, are cultivated in parks and along 

 streets. They are trees with palmately compound leaves of 5-9 leaflets, conspicuous 



rr l° ; ; te ' ye lo \ or r k flowers - and ^ °™^ -*■ •*» «zssz 



is A. hippocastanum L., the horse chestnut. 



97. ACERACEAE. Maple Family. 

 Leaves simple; plants with perfect flowers; twigs reddish i ACER 



Leaves pmnately compound; plants dioecious; twigs bright green ."".". *."i RTJLAC. 



1. ACER L. Maple. 

 Several exotic species of maples are cultivated as shade trees, the more common 

 being: A. peeudo-platanus L., the sycamore maple, a large tree with drooping racemes 

 woolly ovaries, and deeply 3-5-lobed leaves; A. platanoidcs I,, the Norwav maTea 

 large tree with flowers in corymbs, and shallowly 5-7-lobed leaves; J. SLETl 



lall U 3\7l ,T ndlSh ',: CarCeIy l0bGd lGaVeS; A - ^ L " • -mall tree with' 

 email 3-5-lobed leaves, 3.5-7.5 cm. long. 



Lobes of the leaves meeting in an evenly rounded curve; flowers appearing with the 

 eaves, green, hanging from long stalks, these often 5 cm. long; fruit maturing 

 m summer; body of each fruit distinctly less than twice the length of its scar 



L ° b vel/ow e i»T Tf ng ^ T aDgIe; flOWerS "H""** before i'eleaC™; 



yellow in close clusters on the twigs, the stalks of the pistillate flowers, however 



elongating with the development of the fruit, fruit maturing in May or ate April 



body of each fruit twice the length of its scar or more P ' 



Leaf sinuses (the space between the lobes) intruded less than half the length of the 



lateral lobes, approximately right-angled, the sides nearly straight- minute 



petals present m the flower, in addition to the calyx lobes; Lit wfthout h"r 



ness from the first, 1.5-2.5 cm. long when ripe 2 . A rabnim 



Leaf sinuses intruded more than half the length of the lateral lobes, the sides much 



T»e als ZK I 'I meetmS &t the ^^ fl0W ° r Wl,h CaI ^ lob «* only, no 

 petals fruit woolly when young, retaining a scattered pubescence until matu- 

 rity, 5-7 cm. long when ripe 3. A. saccharinum. 



1. Acer saccharum Marsh 



JiinZt ^^ P f° ma ^ infreqUent - "*■ North - «*ate™ A nd"uth: 

 ward m the mountains. {A. saccharinum Wang.) 



2. Acer rubrum L. 



Swamps and moist woods; common. Feb.-Apr. Eastern U S Red MAPLE - 



Also called swamp maple. 



3. Acer saccharinum L. 



Mverhjnk .; J recent. Ja.-M^h. Eastern TI. 8. ( A. ^^ZhT*' 



One of the earliest trees to flower in the spring. 



2. RULAC Adans. 

 1. Rulac negundo (L.) Hitchc. n 



