134 EPILOBIACEAE. 



Leaves opposite : creeping or floating plants. 1. Isnardia. 



Leaves alternate : erect or ascending plants. 2. Ludwigia. 



Stamens 8, in 2 rows. 3. Jdssiaea. 



Hypanthium prolonged beyond the ovary. 4. Raimannia. 



Fruit nut-like, indeliiscent. 5. Gauea. 



1. ISNARDIA L. Perennial succulent herbs. Leaf -blades relatively wide. 

 Flowers axillary. Sepals 4, broad. Petals minute, reddish to greenish, or 

 wanting. Filaments very short. Ovary short. Style wanting or nearly so. 

 Capsule obovoid or turbinate. 



1. I. repens (Sw.) DC. Leaf-blades ovate, elliptic, or oval, 1-3 cm. long: 

 hj'panthium obpyramidal: sepals ovate-lanceolate: petals as long as the sepals 

 or wanting: capsules obpyramidal. [I. natans (Ell.) Small.] — Lime-sinks in 

 hammocks. — {Ber., Bali., Cuba, Ant.) — Marsh-purslane. 



2. LUDWIGIA L. Annual or perennial herbs. Leaf-blades entire or 

 rarely shallowly toothed. Flowers axillary or terminal. Sepals generally per- 

 sistent. Petals usually 4. Ovary usually 4-celled. Capsule cylindric or pris- 

 matic to subglobose. 



Corolla inconspicuous, obsolete or wanting : capsule opening by valves separating 

 from the disk-like top. 

 Upper stem-leaves with spatulate blades : capsule less than 3 mm. high : anthers 

 nearly 0.5 mm. long or less. 

 Leaf-blades entire : mature sepals orbicular-ovate. 1. L. microcarpa. 



Leaf-blades toothed at the apes : mature sepals lanceolate 

 or triangular-lanceolate. 

 Leaf-blades broadly spatulate : sepals much shorter than 



the hypanthium. 2. L. Simpsonii. 



Leaf-blades narrowly spatulate : sepals about as long 



as the hypanthium. 3. L. Curtissii. 



Upper stem leaves with linear-lanceolate or linear blades : 



anthers nearly 1 mm. long. 4. L. lanceolata. 



Corolla conspicuous : flowers pedicelled : capsule opening by a 



terminal pore. 5. L. maritima. 



1. L. microcarpa Michx. Plants low or depressed: leaf-blades spatulate or 

 obovate-spatulate, 0.5-3 cm. long: sepals triangular: petals wanting: capsules 

 broa<lly obpyramidal, 1.5-2 mm. long. — Hammocks and everglades. F. K. 

 {Ball., Ant.) 



2. L. Simpsonii Chapm. Plants weak, often decumbent: leaf-blades 1-2.5 cm. 

 long: sepals triangular: petals wanting: capsules broadly turbinate, about 2 

 mm. long. — Hammocks. 



3. L. Curtissii Chapm. Plants erect or ascending: leaf-blades 1-2 cm. long: 

 sepals lanceolate or triangular-lanceolate: petals wanting: capsules turbinate, 

 2-2.5 mm. long. — Everglades. 



4. L. lanceolata Ell. Plants 3-9 dm. tall, the stem angled or sometimes 

 winged: leaf-blades linear-oblanceolate to linear-lanceolate or linear, 2-10 cm. 

 long: sepals very broad, acute: petals wanting: capsules 4-5 mm. long, the 

 angles margined. — Everglades. 



5. L. maritima Harper. Plants fastigiately branched, glabrous or nearly so: 

 leaf-blades linear to lanceolate: sepals 3-4 times as long as the hypanthium, 

 permanently reflexed: capsules very slightly winged on the angles. — Pinelands. 



3. JUSSIAEA L. Perennial herbs or partially woody plants. Leaf-blades 

 usually entire. Flowers axillary. Sepals 4-6, persistent. Petals 4-6, white or 

 yellow, or rarely none. Stamens 8-12. Ovary 4-6-celled. Capsule linear, 

 oblong or clavate. 



1. J. peruviana L. Stems 1-4 m. tall, hirsute: leaf -blades ovate, oval, lanceo- 

 late, or oblong-lanceolate, 4-10 cm. long, or more: hypanthium hirsute: sepals 



