Acer. ACERACE^. 247 



♦• Flowers in pedunculate umbel-like curijmbs, terminating the leafy branches, ap- 

 pearing ivilh the. leaves. 



4. A. circinatum (Pursh): leaves cordate, 7-9-lobed, the nerves all radia- 

 ting directly from the apex of the petiole; lobes very acutely serrate, wiili a 

 slender acumination ; corymb few-flowered ; petals ovate or linear, shorter 

 than the calyx; fruit glabrous, with oblonij divaricate Avings. — Pvr.f/i, //. 

 1. p. 26(3; Hook. fl. Bur.-Ani. 1. p. 112,/. 39; Null. in jour. acad. Philad. 

 7. p. 1(5, excl. syn. 



On the Great Rapids of the Oregon, Lev-is ex Pursh, Nnttall! and N. 

 W. Coast between lat. 43^ and 49^, Douglas, Scouhr ! " Confined, like 

 the preceding, to the woody mountainous country that skirts the shores, where 

 it forms almost impenetrable thickets; the pendulous and rrooked branches 

 often taking root." Douglas, \n Hook. April-May.— Trunk 20-40 feet higli; 

 bark smooth; wood tine, white, close-grained, susceptible of a good polish. 

 Douglas. ['' like that of the Red Maple, and presents a beautiful curled tex- 

 ture." Nuttall.\ Leaves as large as those of A. rubrum, with a woolly tuft 

 at the apex of the petiole ; the veins hairy, but in old leaves nearly glabrous ; 

 lobes oblong or ovate-lanceolate, very acute. Sepals purple. Petals nearly 

 white. Fruit with thin straight wings, which are so divaricate as to form 

 right angles with the peduncle; the lower margin scarcely thickened. 



5. A. glabrum (Torr.): leaves nearly orbicular, truncate or subcordate at 

 the base, 3-5-lobed ; lobes short and broad, acutely incised and toothed ; flow- 

 ers ... ; fruit glabrous, the Avings very short and broad (somewhat 

 obovate), rather diverging. — To7~r. ! in ann. lye. Neiv-York, 2. p. 172. 



In the Rocky Mountains about lat. 40^, Dr. James .'—A small shrub. 

 Leaves nearly similar to those of the common Currant in size and shape, gla- 

 brous, commonly 3-lobed, with very acute and narroAV sinuses which hardly 

 reach to the middle of the leaf; lobes broader than long, obtuse, often some- 

 what 2-3-lobed. Flowers not seen. Peduncles in fruit very short, 2-3-flow- 

 ered. Wings of the fruit about the size of those of A. campestre, or a httle 

 shorter, but broader in proportion and more obtuse. 



6. A. tripartitum (Nutt. ! mss.) : "leaves with a subreniform -orbicular 

 circumscription, 3-cleft or 3-parted ; segments incisely toothed ; the middle 

 one cuneiform, often slightly lobed, the lateral ones somewhat rhomboid ; ra- 

 cemes corymbose; fruit glabrous, with very short and broad cuueate-oval di- 

 verging wings. 



'•'On Bear-Ridge, Rocky Mountains, lat. 40°, near the line of Upper Cali- 

 fornia. — A shrub with whitish smooth branches. Leaves about the size of 

 those of the common Currant, usually 3-parted to the base, sometimes only 

 cleft half-way down ; the central segment broadly cuneiform, and, as Avell as 

 the lateral ones, slightly 3-lobed. Calyx about 8-parted ; segments oblong. 

 Fruit small, very similar to that of A. glabrum, to which it is nearly allied." 

 2Vi(/^— Notwithstanding the difference in the division of the leaves, we ap- 

 prehend that this and the preceding may prove to be forms of the same spe- 

 cies. 



*** Flowers in nearly sessile umbel-like coryvibs, with very long filiform pedicels, ap- 

 pearing V-iith the leaves ; the fertile coryrnbs terminating the branches ; the infertile 

 from lateral leafless buds. 



7. A. grandidentatum ("Nutt. ! mss.) : leaves slightly cordate or truncate 

 at the base, rather deeply 3-lobed, the sinuses broad and rounded ; lobes slight- 

 ly acute, with a few sinuous indentations ; corymb nearly sessile, few-flow- 

 ered ; the pedicels long and nodding ; fruit glabrous, with small diverging 

 wings." Nutt. — A. barbatura, Dougl. in Hook. I. c. ? 



