110 ACERACE.E. vms. 



ACER. 



1 VITLS Tourn. Inst 6L3. L. Gen. n. 234. (GRAPE.) 



Woody vines, climbing by tendrils that are opposite to leaves, 

 with acid juice, mostly simple opposite leaves and small greenish 

 flowers in compound racemes or panicles that are opposite the 

 upper leaves. , Calyx very small, entire or 4-5-toothed or -lobed. 

 the tube filled with a fleshy annular disk which bears the 4 or o 

 thick caducous petals' and the distinct stamens. Fruit a more or 

 less pulpy berry. 



V. Calif ornica Bentli. Bot, Snip. 10. Stems often 12 inches in 

 diameter below, climbing trees to the height of 2030 feet: leaves 

 round-cordate with a deep and narrow sinus, 2 3 inches long, nearly 

 as broad, obtuse, rather coarsely serrate and often somewhat 3-lobed, 

 tomentose or canescent, especially beneath: fruit 4 lines in diameter, 

 in rather large clusters, purple, covered with bloom: seeds broad. 

 Along streams, from the Umpqim Valley. Oregon, to southern Califor- 

 nia. 



OKPKII XXIV ACKIIACE^; J. St. Mil. Expos. Fain, ii, 15. 



Trees or shrubs with opposite palmately lobed or pinnately 

 3-5-foliolate ("rarely alternate and entire) leaves without stip- 

 ules and small flowers in lateral or terminal racemes or fasci- 

 cles that are often by a bortion polygamous or dioecious. Sepals 

 6, rarely 4-9, more or less united, imbricate in the bud. Pet- 

 a 1 s as many as sepals and alternate with them, inserted around 

 a commonly lobed hypogynous disk, sometimes wanting. Sta- 

 mens usually 8, sometimes 3-12, distinct inserted on the disk: 

 anthers introrse or versatile. Ovary 2- lobed, composed of 2 

 united carpels each containing 2 collateral ovules, or a single 

 2o vuled carpel. Styles more or less combined, stigmatose on 

 the inside or the stigma almost sessile. Fruit composed of 2, 

 rarely 3 cr 4, indehiscent samarioid carpels, finally separable 

 from the filiform axis the wing thickened at the lower margin, 

 or a cartilaginous follicle. Seeds 1 or 2 in each cell, erect, 

 with little or no albumen. Embryo curved or nearly straight, 

 with foliaceous cotyledons variously folded upon each other. 



1 Acer. Leaves opposite, palmately lobed or rarely divided : flowers in 



racemes or fascicles, polygamous. 



2 Forsellesia. Leaves alternate, simple and entire : flowers solitary ter- 

 minating short axillary branches or spar-like fascicles, perfect. 



1 ACER Tourn. Inst. 615, L. Gen. 1155. (MAPLE.) 



Trees or shrubs with opposite mostly palmately lobed leaves 

 and small flowers in terminal racemes, umbel-like corymbs or 

 fascicles. Calyx colored, usually f-lohed. Petals 5, sometimes 

 wanting. Stamens 3-12, usually 8, inserted with the petals up- 

 on a lobed hypogynous disk. Styles 2, elongated. Ovary 2- 

 lobed, rarely 3- or 4-lobed, and as many celled, with a pair of 

 ovules in each cell, becoming in fruit a double, rarely triple* or 

 quadruple, samara that is separable at maturity into 1-seeded 

 indehiscent winged nutlets. 



