BLADDER NUT FAMILY 151 
58. STAPHYLEACEH. BuiappEer Nut Famity 
Shrubs. Leaves pinnately compound, with stipules, and 
the leaflets with little individual stipules (stipels). Flowers 
regular and perfect. Calyx lobes 5. Petals 5, inserted in or 
around a saucer-shaped disk. Stamens 5, alternate with the 
petals, perigynous. Ovary 2-3-celled, with the carpels more 
or less distinct; ovules several; styles 2-3, somewhat united 
below. Fruit usually 1-few-seeded. 
STAPHYLEA L. 
Calyx deeply 5-parted, the lobes appearing like separate 
sepals, erect. Petals spatulate, borne on the rim of the thick 
disk. Pod large, papery, 3-celled, finally opening at the top. 
Seeds 1-4 in each cell, bony. 
1. S. trifolia L. American BiappEeR Nout. A shrub 6-12 ft. 
high, with smooth, slender, greenish-striped, at length gray, branches. 
Leaves long-petioled, with 3 ovate, taper-pointedy finely serrate leaf- 
lets. Damp thickets. 
59. ACERACEZ. Mapre FAmity 
Trees or shrubs, with abundant, often sugary sap. Leaves 
opposite, simple and palmately lobed, or pinnate, without 
stipules. Flowers regular, mostly somewhat moncecious or 
dicecious, in axillary and terminal cymes or racemes. Calyx 
4-9-parted. Petals as many as the lobes of the calyx or none. 
Stamens 4-12, hypogynous. Ovary 2-celled; styles 2. Fruit 
a double key.* 
ACER L. 
Characteristics of the genus as above given for the family. 
1. A. saccharum Marsh. Sucar Mapte. A large tree. Leaves 
simple, palmately lobed, truncate or heart-shaped at the base, lobes 
sinuate-toothed and acuminate, pale and slightly downy beneath. 
Flowers appearing with the leaves, on clustered drooping pedicels. 
Calyx bell-shaped, fringed. Petals none. Keys smooth, wings about 
