68 
= = Flowers in loose and slender axillary panicles: fruit globular, glabrous, whitish or 
dun-colored : stone striate: leaves 3-foliolate, thin : poisonous. 
2. R. Toxicodendron L. (POISON IVY. Poison OAK.) Climbing by rootlets 
over rocks, etc., or ascending trees, or sometimes low and erect: the 3 leaflets 
rhombic-ovate, mostly pointed, rather downy beneath, variously notched, sinuate, 
or cut-lobed.—A species of the Atlantic States, very common on all the streams of 
southern and western Texas. 
_ - + Flowers usually in small solitary or clustered spikes or heads which develop in 
spring before the leaves : leaves 3-foliolate or pinnate : fruit as under —. 
3. R. Canadensis Marsh. A straggling bush: leaves soft-pubescent when young, 
becoming glabrate, 3-foliolate ; leaflets rhombic-obovate or ovate, unequally cut- 
toothed, 2.5 to 7.5 cm. long, the terminal one cuneate at base and sometimes 3- 
cleft : flowers pale yellow. (R. aromatica Ait.)—A common eastern species extend- 
ing into Texas, but more abundantly represented throughout the State by var. 
TRILOBATA Gray, Which has smaller leaflets, 12 to 25 mm. long, crenately few-lobed 
or incised toward the summit. 
4. R. microphylla Engelm. A large shrub, with numerous small warty branch- 
lets: leaves odd-pinnate with 7 to 9 leaflets and a winged rhachis; leaflets sessile, 
small, 6 to 8 mm. long, oval, obtuse or mucronate, very entire or indistinctly crenu- 
late: flowers in scaly spikes 3-practeolate at base.—Abundant on bluffs and slopes 
between the Colorado and the Rio Grande. 
5, R. virens Lindh. Leaves evergreen, odd-pinnate with 7 to 9 leaflets and a 
naked rhachis; leaflets ovate or oblong, obtuse or obtusely acuminate, very entire, 
thick and rigidly coriaceous, shining above, pale or minutely tomentulose under a 
lens beneath, 2.5 cm. or more long: flowers in axillary or apparently terminal rather 
open panicles, the fruit clusters more evidently axillary and spicate-racemose,—From 
the Colorado to the Rio Grande and westward. The leaves, mixed with tobacco, 
are smoked by Mexicans and Indians. 
** Ovary becoming very gibbous in fruit, with the remains of the style lateral : flowers in 
loose ample panicles, the pedicels elongating and becoming plumose : leaves simple, entire. 
6. R. cotinoides Nutt. A tree 9 to 12 m. high, glabrous or nearly so: leaves thin, 
oval, 7.5 to 15 cm. long. —A sumach of the Indian Territory, but collected by Rever- 
chon in Bandera County. 
LEGUMINOSZ. (PULSE FAMILY.) 
Plants with alternate stipulate usually compound leaves, papilio- 
naceous or sometimes regular flowers, 10 (rarely 5 or many) monadel- 
phous, diadelphous, or rarely distinct stamens, anda single simple free 
pistil becoming a legume in fruit.—A very large order, well represented 
in Texas, and divided into the three following suborders : 
IL. PAPILIONACEH. Leaves simple or simply compound, leaflets almost always entire, 
flowers perfect, solitary and axillary, or in spikes, racemes, Or. panicles, calyx of 5 
sepals more or less united (often unequally so), corolla of 5 irregular petals (rarely 
fewer), more or less papilionaceous, i. &., with the upper petal (standard) largest 
and inclosing the others in bud, usually turned backward or spreading, the two 
lateral ones (wings) oblique and exterior to the two lower, which last are connivent 
or coherent by their anterior edges and form the keel which usually incloses the 
stamens and pistil. 
A. Stamens 10 and distinct. 
1. Baptisia. ‘ Leaves palmately 3-foliolate: calyx 4 or 5-lobed: pod inflated. 
2. Sophora. Leaves pinnate: calyx-teeth short: pod terete, necklace-shaped 
(moniliform ). 
