65 
2. SERJANIA Plum. 
Shrubby climbers, with alternate exstipulate ternate or pinnate leaves, 
axillary racemes or panicles of small yellowish flowers often bicirrhose, 
and fruit consisting of 3 broadly- winged membranaceous samaras, which 
are seed-bearing at apex. 
1. S. incisa Torr. Leaves with two pairs of 3-foliolate pinn»; leaflets ovate- 
rhomboidal, incised-serrate, pubescent on both sides, acute at each end, 2.5 to 3.5 em. 
long: flowers in racemiform panicles: fruit 3.5 em. long, at first pubescent, at length 
nearly smooth, the outline from obovate-oblong to cuneate, obtuse at base: seed- 
bearing portion reticulately veined: wings 6 to 10mm. wide, rather obtuse at base,— 
Along the lower Rio Grande. This Species has also been referred to the Mexican 8, 
racemosa Schum. 
2. S. brachycarpa Gray. Leaves biternate; terminal leaflets ovate-lanceolate 
and attenuate into a petiole; laterals ovate and sessile, all mucronulate and with a 
few serrations, or teeth, more or less shortly hirsute above and softly (sometimes 
rusty) tomentose beneath, 1.5 to 3.5 em. long: flowers in a thyrsus: fruit much 
smaller, scarcely over 1 em, long, puberulent, the outline very shortly cordate-ovate 
with dilated base: seed-bearing portion lenticular, obscurely veined: wings about 
3mm. wide.—Near the coast, from Corpus Christi Bay southwards. 
3. CARDIOSPERMUM L. (Hrarr-sxxp. BALLOON-VINE.) 
Mostly an herbaceous climber, with alternate exstipulate twice ter- 
nate leaves, incised leaflets, axillary racemose-paniculate clusters of 
small white flowers, with the peduncle bicirrbose at apex, and a mem- 
branaceous 3-lobed 3-celled inflated pod. 
1. C. Halicacabum L. (Common BALLOON-VINE.) Annual and nearly glabrous: 
leaflets ovate-lanceolate, incisely lobed and toothed: fruit large, roundish pear- 
shaped, 2.5 cm. in diameter.—From the Guadalupe to the Rio Grande. 
2. C. molle L. Resembling the last, but the whole plant with soft pubescence, 
which is spreading on the stem and more or less appressed on the thicker coarsely 
and almost regularly serrate leaflets: fruit subglobose, pubescent.—A north Mexi- 
can species, found in the mountains west of the Pecos. 
4. ZESCULUS L. (Horsr-cuestnor. BUCKEYE. ) 
Trees or shrubs, with opposite digitate exstipulate leaves, serrate pin- 
nately-veined leaflets, showy flowers in a large terminal thyrsus or 
panicle, a large leathery 3-valved pod, and seeds with a thick shining 
coat and large round sear. 
1, 4. flava Ait. (Sweer BUCKEYE.) A large tree or shrub: leaflets 5 or 7, gla- 
brous or often minutely downy underneath: calyx oblong-campanulate: petals 4, 
conniving, the 2 upper smaller and longer than the others, with a small rounced 
blade on a very long claw: stamens included in the yellow corolla: fruit smooth.— 
Extending from the Atlantic States to the valley of the Brazos. Var. PURPURASCENS 
Gray has calyx and corolla tinged with flesh-color or dull-purple, and leaflets com- 
monly downy underneath.—Mostly an arborescent shrub, apparently not extending 
south or west of the Guadalupe and its tributaries, 
2. 48. arguta Buckley. Shrub 9 to 15 dm. high: leaflets 7, narrowly lanceolate, 
mostly long acuminate, glabrous, sharply serrate, 5 to 10 cm, long: stamens erect or 
slightly curved, much longer than the pale yellow corolla: flowers sometimes in 
23204—vol. 2, No. 15 
