FABACEAE 613 
14. ROBINIA L.! 
Shrubs or trees, with glabrous, glandular or bristly foliage, sometimes armed with 
spine-like stipules, the foliage not grandular-dotted. Winter buds naked, in the petiole- 
bases. Leaves alternate: blades unequally pinnate: leaflets opposite or nearly so, the 
blades entire. Flowers perfect, in axillary or rarely terminal racemes. Calyx pedicelled : 
lobes 5, acute, the 2 upper more united than the rest and often shorter. Corolla white, 
pink or purplish : standard witha broad reflexed blade, naked within : wings curved, free : 
keel-petals incurved, united below. Stamens 10, diadelphous ; the free filament sometimes 
united to the middle of the tube. Anthers alike or those opposite the petals smaller. 
Ovary stalked. Style subulate. Ovules several. Pod narrow, flat, short-stalked, glabrous, 
bristly or prickly. Seeds oblique, with a thin crustaceous testa. Locusr. 
Pods smooth and glabrous: corolla white. 1. R. Pseudacacia. 
Pods prickly, hispid, bristly or glandular: corolla pink or purplish. 
Peduncles not hispid. 
Twigs, and often the petioles and pedicels, viscid. 2. R. viscosa. 
Twigs and peduncles not viscid. 
Leaves, twigs and peduncles glabrous. 3. R. Boyntonii. 
Leaves and branches of the inflorescence pubescent. 4. R. Elliottii. 
Peduncles hispid. 
Twigs hispid. 5. R. hispida. 
Twigs merely pubescent. 6. R. nana. 
1. Robinia Pseudacàcia L. A tree 6-35 m. tall, with firm brown furrowed bark, 
hard and very durable wood, especially in contact with the soil, horizontal or spreading 
branches, and short twigs, forming an oval or irregular crown. Foliage and inflorescence 
glabrous, or soon becoming so : stipules spiny on vigorous shoots : leaflets 9-19, the blades 
thin, 2.5-4.5 em. long, elliptic or ovate: racemes drooping, dense, 10-25-flowered, 1-2 
dm. long: corolla 15-20 mm. long, white, except a yellow spot on the standard : pods 
glabrous, flat, 5-10 cm. long, 10-15 mm. wide, 3-10-seeded. 
Native from Pennsylvania to Iowa, Georgia and the Indian Territory. Also naturalized in north- 
eastern North America. Spring. 
2. Robinia viscósa Vent. A shrub, or exceptionally a small tree 3-8 m. tall, with 
rough dark gray bark, and spreading branches forming a round crown, or in cultivation 
much larger. Twigs, pods, and often petioles and peduncles glandular-viscid : foliage and 
inflorescence glabrate or appressed-pubescent: stipules small, setaceous, exceptionally 
spiny on vigorous shoots : leaflets 11-27, the blades thick and firm, ovate, oblong or ellip- 
tic, 2.5-4 cm. long: racemes 5-8 cm. long, 6-15-flowered, ascending: corolla 15-22 mm. 
long, pink : pod flat, 5-8 cm. long, often contracted between the seeds, sparingly glandular- 
hispid, 2-7-seeded. à 
: In dry rocky woods, middle North Carolina to Alabama. Local. Often escaped from cultivation 
in the Atlantic States. Spring. 
_3. Robinia Boyntdnii Ashe. A large shrub 2-3.5 m. tall, with ascending branches. 
Twigs glabrous or at first minutely pubescent: stipular spines none: leaves 1-1.5 dm. 
long ; leaflets 7-13, the blades oblong or elliptic, 1.8-2.5 em. long, soon glabrous : racemes 
loosely 8-12-flowered : corolla rose-purple or pink, with white, about 18 mm. long; 
Standard with the blade abruptly contracted into the claw : peduncles ascending or spread- 
ing: pods slender, hispid. 
Alabama. Vern pa epes.. rd at high elevations, North Carolina and Tennessee to Georgia and 
. 4. Robinia Hllióttii (Chapm.) Ashe. A shrub 6-15 dm. tall. Stem erect, virgate, 
with few short, stout branches near the summit, the twigs, especially when young, white 
9r grayish canescent: stipular spines short and stout: leaves 10-14 cm. long; leaflets 
11-15, the blades elliptic, 1.5-2.8 em. long: calyx, peduncles and pedicels canescent: 
corolla rose-purple or purple and white: pods linear, hispid. 
Chiefly near the coast, North Carolina to Georgia. Local. Late spring. 
5. Robinia hispida L. A straggling shrub 3-10 dm. tall, often branching from the 
ase. Twigs, stem, peduncles, and often petioles and calyx, densely bristly hispid, or 
vans nearly smooth : stipular spines short, often present: leaves 1-2 dm. long; 
eaflets 7-11, rarely 13, the blades oblong to nearly orbicular, 1.8-3.5 cm. long, glabrate: 
racemes 3—5-flowered : corolla about 25 mm. long, purple or red-purple : pods 5-8 em. long, 
stout, few-seeded, densely hispid, and often glandular-hispid, with purple bristles. 
A o near the mountains, Virginia and Kentucky to Georgia and Alabama. Spring and early 
SEEE a NON TN 
! Contributed by Mr. W. W. Ashe. 
