Buckeye Family. 31 



bluff*: April: a frequent tree along the water courses of eastern and south- 

 ern Iowa, extending far into the interior. Allamakee to Lee county, thence 

 west as far as Decatur county. {A. saccharlnum Wang.) 



A. nigrum Ms. Similar to the preceeding; leaves green both sides, pube- 

 scent beneath at least on the veins, lobes shorter, broader, but little undulate 

 or often entire, sinuses very obtuse, the basal one nearly closed. With the 

 preceeding: Fayette. Story, Decatur and Emmet counties: infrequent or rare: 

 often put as var. nu.prum T. £ (*. of the preceeding. 



A. rubrum L. R d or Swamp M. Twigs reddish: leaves 3-n-lobed. lobes 

 serrate, acuminate, green above, pale or whitish beneath, sinuses acute, base 

 cordate: flowers reddish or yellowish, short pedicelled: petals linear-oblong: 

 fruiting pedicels elongated. Low grounds along river: rare; Johnson 

 county. 



A. spicctum Lam. Mountaim M. A shrub or small tree; leaves 3-5-lobed, 

 glabrous above, pubescent beneath, coarsely serrate, lobes acuminate; flow- 

 ers in a dense erect compound raceme, greenish yellow, appearing after the 

 leaves: petals linear-spatulate: samaras small somewhat divergent. Bluffs of 

 the Mississippi river: Allamakee. Clayton, and Dubuque counties: rather 

 rare. 



* » Leaves pinnate; flowers dioecious. 



A. negundo L. Cor E'Aer. As.'b-leaved 3f. Tree of average size: leaflets 3- 

 5, ovate or oval, pubescent when young, becoming glabrous, acute, dentate or 

 entire: flowers dioecious, appearing shortly before the leaves, drooping, 

 small, apetalous: samaras glabrous somewhat incurved. Low woods: April: 

 common. (Negundo aceroides Moench i 



HIPPOCASTAXACEAE T. & G. Buckeye Family. 



Trees or shrubs, with opposite petioled di^itately 5-7-foliate leaves, 

 and irregular polygamous paniculate flowers. Calyx tubular, 5-toothed. 

 Petals 4-5, unequal, clawed. Stamens 7, filaments slender, unequal. 

 Ovary 3-celled, with 2 ovules in each cell. Fruit coriaceous, 3-celled. 3- 

 valved, 3-seeded or by abortion 1-celled, 1-seeded. Represented by the 

 trenus Aesculus L. 



AE. glabra Willd. Ohio Buckeye. Tree 10-40 feet high, bark fetid: leaves 

 long-petioled: leaflets 5, ovate to lanceolate, acuminate, finely serrate; flow- 

 ers in terminal th\*rsoid panicles, pale yellow: petals 4: stamens curved, ex- 

 serted: fruit globular, covered with prickles: seed large, shining, red; scar 

 large, roundish, pale. Alluvial soil and rich uplands: May: frequent; Des 

 Moines, Lee. Henry. Van Buren. Jefferson, Johnson, Boone, Polk, Appanoose. 

 Decatur. Ringgold. Union, and Taylor counties. 



AE. octandra Marsh. Sweet B. Flowers yellow: petals 4. conniving. 

 long-clawed: stamens included: fruit smooth. May: Jasper county, reported 

 by Prof. Shimek: apparently infrequent. (AE. flava Ait.) 



STAPHYLEACEAE DC. Bladder-nut Family. 



Ours a small shrub, with 3-foliate stipulate leaves, and axillary droop- 

 ing racemose flowers. Sepals, petals, and stamens 5. Styles 3. Pod 

 Large, membranous, inflated. 3-lobed, 3-celled, separating above, each cell 

 with 1-4 bony seeds. Represented by the £enus Staphvi.ka L. 



S. trifolia L. American Bladder-nut. Shrub 4-12 feet high: flowers white 

 Moist woods: May: frequent throughout. 



