654 



3. Ludwigia glandulosa Walt. CYLIXDRIC-FRUITED LUDWIGIA. (I. F. f. 

 2559.) Stems glabrous, much branched, 3-9 dm. high. Leaves sessile or narrowed 

 into short petioles, oblong-lanceolate, acute at each end, 5-10 mm. long; flowers 

 axillary, rarely 2 together, greenish, about 2 mm. broad; bractlets at base of calyx 

 minute or none; calyx-lobes triangular-ovate, acute; petals none; capsule 4-grooved, 

 6-8 mm. long, glabrous, 4-5 times as Ipng as the calyx-lobes. In swamps, 

 southern 111. and Mo. to Kans., Tex., east to Fla. and S. Car. July-Sept. 



4. Ludwigia alata Ell. WING-STEMMED LUDWIGIA. (I. F. f. 2560.) 

 Stems 3-9 dm. tall, winged, often stoloniferous ; lea ves linear-oblanceolate to linear- 

 lanceolate, or sometimes nearly linear, 2.5-10 cm. long, those of the stolons sub- 

 orbicular or spatulate; flowers inconspicuous, about 4 mm. broad, white or greenish ; 

 calyx glabrous, its segments triangular-ovate, acute or acuminate ; petals none; cap- 

 sules 3-4 mm. high, winged; seeds about 0.5 mm. long, faintly pitted. In marshes, 

 N. Car. to Mo., Fla. and La. June-Sept. 



5. Ludwigia linearis Walt. LINEAR-LEAVED LUDWIGIA. (I. F. f. 2561.) 

 Stems branching, glabrous, 3-7.5 dm. high, often stoloniferous, lower part clothed 

 with serenchyma. Leaves narrowly linear, sessile, acute at each end, 2.5-5 cm - 

 long, about 2 mm. wide, the margins roughish, or those of the stolons obovate ; 

 flowers sessile, about 4 mm. broad; calyx-lobes triangular-ovate, acute, slightly 

 shorter than the yellowish petals; capsule narrowed at the base, 6-8 mm. long, 3-5 

 times as long as the calyx-lobes. In swamps, southern N. Y. to Fla., west to La. 

 July-Sept. 



6. Ludwigia hirtella Raf. HAIRY LUDWIGIA. (I. F. f. 2562.) Stems 

 branching, 3-6 dm. high. Leaves oblong-lanceolate or ovate-lanceolate, sessile, ob- 

 tuse at the apex, rounded at the base, 2.5-3 cm. long; flowers solitary, peduncled, 

 12-20 mm. broad; calyx-lobes ovate-lanceolate, acute, somewhat shorter than the 

 yellow petals; capsules cubic with a rounded base, about 5 mm. high, shorter than 

 the calyx-lobes, opening by an apical pore. In swamps, pine barrens of N. J. to 

 Fla., west to Tex. June-Sept. 



7. Ludwigia alternifolia L. SEED-BOX. RATTLE BOX. (I. F. f. 2563.) Stems 

 branching, 6-12 dm. high. Leaves short- petioled, lanceolate, acute or acuminate 

 at the apex, 5-12 cm. long; flowers short-peduncled, solitary, 12-16 mm. broad; 

 calyx-lobes ovate, acuminate, about equalling the yellow petals which fall away 

 when the plant is shocked ; capsules cubic with a rounded base, slightly wing-angled, 

 about 5 mm. high, opening by a pore. In swamps, N. H. to northern N. Y., Ont.(?j, 

 Mich., Fla., Kans. and Tex. Roots often tuberous. June-Sept. 



Ludwigia alternif61ia linearifblia Britton. Leaves linear, elongated; calyx-lobes 

 linear-lanceolate; petals more persistent. W. Va. 



4. JUSSIAEA L. 



Perennial herbs, with alternate, usually entire leaves, and white or yellow, axil- 

 lary flowers. Calyx-lobes acute, persistent. Petals 4-6 (rarely more). Stamens 

 8-12, in 2 rows. Ovary 4-6-celled. Capsule linear, oblong or club-shaped, an- 

 gular or ribbed, septicidally dehiscent. [In honor of Bernard de Jussieu, 1699- 

 1777, founder of the Natural System of Botany.] About 35 species, of warm and 

 temperate regions. Besides the following 7 others occur in the Southern States. 



Creeping or floating; petals 5; capsule cylindric. i. J. diffusa. 



Erect; petals 4; capsule club-shaped, 4-sided. 2. J. decurrens. 



1. Jussiaea diffusa Forskl. FLOATING OR CREEPING JUSSIAEA OR PRIM- 

 ROSE-WILLOW. (I. F. f. 2564.) Stem 3-9 dm. long. Leaves oval, oval-lanceo- 

 late or obovate, slender-petioled, veiny, obtuse or acute at the apex, 2.5-10 cm. 

 long; peduncles slender; flowers yellow, 12-25 mm. broad; calyx-lobes 5, lanceo- 

 late; stamens 10; capsule ridged, 2.5-4 cm. long; seeds in i row in each cavity. 

 In ponds, Ky. and 111. to Kans., Fla. and Tex. Alsointrop. Am. and Asia. June- 

 Aug. 



2. Jussiaea decurrens (Walt.) DC. UPRIGHT PRIMROSE-WILLOW. (I. F. 

 f. 2565.) Stem angled, branching, 3-6 dm. high. Leaves lanceolate, acute or 

 acuminate at the apex, decurrent on the stem. 2.5-10 cm. long; flowers short-pe- 

 duncled, yellow, 8-12 mm. broad; calyx-lobes 4, ovate-lanceolate; stamens 8; cap- 



