2. Acer barbatum Michx. Florida maple, southern sugar maple. 



Tree to 20 m. high, with thin whitish-gray smooth bark that becomes furrowed 

 in age, the trunk to 7 dm. in diameter; branchlets grayish and purple-tinged, 

 glabrous to short-pilose; leaves with glabrous to pilose petioles to 75 mm. long, 

 3- to 5-lobed, minutely pilose to glabrescent and somewhat glaucescent beneath, to 

 9 cm. long and 1 1 cm. broad, truncate to subcordate at base, with entire or 

 slightly lobulate obtuse to acute lobes; flowers yellowish-green, with pedicels 

 elongating to 5 cm., in many-flowered nearly sessile corymbs; calyx to 2.5 mm. 

 long, with a conspicuous long white beard projecting from throat; corolla absent; 

 ovary long-setose; samaras 1.5-3 cm. long, fruit body to 1 cm. long, sparingly 

 villous while young, the wings to 9 mm. wide. A. flon'danum (Chapm.) Pax, 

 A. saccharum var. floridanum (Chapm.) Small & Heller. 



Along streams and in wettish flat woodlands in s.e. Tex., Mar.-Apr.; from 

 Fla. to s.e. Tex., n. to e. Va. and s.e. Mo. 



3. Acer rubrum L. Red maple, scarlet maple. 



Tree to about 35 m. high, with spreading to ascending smoothish branches to 

 form a globular crown, the trunk to about I m. in diameter; branchlets red; 

 leaves with mostly reddish petioles to 1 dm. long, 3- to 5-lobed, to I dm. long 

 and wide, the margins coarsely serrate, broadly cuneate to rounded or subcordate 

 at base, the lobes triangular-ovate and short-acuminate, herbaceous to somewhat 

 coriaceous, dark-green and lustrous above, glaucous and subglabrous to densely 

 whitish- or tawny-pubescent beneath, mostly always pubescent on veins beneath; 

 flowers appearing before the leaves, usually reddish, on slender stalks; petals 

 linear-oblong, about 2 mm. long; samaras 15-25 mm. long, on pendulous stalks 

 to 1 dm. long, glabrous, the fruit body about 8 mm. long, the wings to about 12 

 mm. wide. 



Usually in swamps, along streams or in alluvial woods in e. Tex. and Okla. 

 {Waterfall), Feb.-Apr.; from Fla. to Tex., n. to Man. and e. Can. 



The var. rubrum has, at most, hairs along the nerves on the lower surface of 

 the leaves, whereas the var. Drummondii (H. & A.) Sarg. and var. trilobum 

 K. Koch have the lower surface of their leaves densely and usually permanently 

 hairy. In addition, the leaves of var. trilobum have only three well-developed 

 lobes, with the smaller lateral basal lobes being suppressed. 



Fam. 85. Balsaminaceae A. Rich. Touch-me-not Family 



Herbs or undershrubs with bland watery juice; leaves alternate, opposite 

 or rarely whorled, simple, exstipulate; flowers irregular, perfect, hypogynous; 

 calyx petaloid, imbricated, spurred; stamens 5, with short flat filaments and 

 introrse more or less connivent obconic anthers; ovary 5-celled; fruit a capsule 

 or berry; seeds without albumen. 



About 500 species in 4 genera, mostly in the tropics of Asia and Africa. 



1. Impatiens L. Touch-me-not. Jewel-weed. Balsam 



Annual or perennial herbs; stems fistulose, succulent; leaves simple, alternate 

 or whorled; flowers zygomorphic, in pedunculate clusters or 1 to 3 in leaf axils; 

 sepals (in ours) 3. the two upper ones (as the flower hangs on its pedicel) small, 

 the lower saccate one open in front and spurred at bottom of sac; petals 5, 

 appearing to be 3, the upper one often broader than long, each of the two lateral 

 ones lobed and regarded as 2 petals united; fruit dehiscing elastically into 2 valves. 



About 400 species, nearly all of which are in the Old World. 



1105 



