GUNNEEACEAE. 135 



lanceolate to ovate-lanceolate, 10-15 mm. long: petals 2-3 cm. long: capsule- 

 body oblong-obovoid, slightly longer than the base. Everglades and banks of 

 streams. (Cuba, Ant.) 



4. RAIMANNIA Eose. Annual, biennial, or perennial herbs. Leaf- 

 blades sinuate or pinnatifid. Flowers axillary, sometimes aggregated in a 

 spike, nocturnal. Petals yellow. Ovary slender. Capsule narrowly cylindrie, 

 or rarely slightly tapering. Seeds tubercled. 



1. R. humifusa (Nutt.) Eose. Branches silky- canescent : blades of the cauline 

 leaves oblanceolate to lanceolate, undulate, repand or toothed: sepals about i 

 as long as the hypanthium: petals 8-13 cm. long: capsules 3-3.5 mm. in 

 diameter. [Oenothera humifusa Nutt.] Coastal sand-dunes. F. K. (Ber.) 

 EVENING-PRIMROSE. 



, V 



5. GAURA L. Annual, biennial, or perennial herbs. Leaf-blades entire, 

 toothed, or pinnatifid. Flowers spicate or racemose. Hypanthium narrow, 

 somewhat prolonged beyond the ovary. Petals unequal, with clawed blades. 

 Stamens 8, declined. Style declined. Stigma 4-lobed, surrounded by a cup- 

 like border. Fruit ribbed or angled. 



1. G. simulans Small. Stems 9-20 dm. tall, loosely pubescent below: blades of 

 the stem-leaves oblanceolate or narrowly spatulate to lanceolate or linear- 

 lanceolate, 2-12 cm. long, pinnatifid to sharply toothed: sepals broadly linear, 

 rather obtuse: petals pinkish, 4.5-5 mm. long: fruits, 8-10 mm. long, glabrous. 

 Pinelands and coastal sand-dunes. 



FAMILY 8. GUNNERACEAE. WATER-MILFOIL FAMILY. 



Perennial, or rarely annual, aquatic or amphibious herbs. Leaves 

 alternate to whorled: blades entire to dissected, often of 2 kinds on the 

 same plant. Flowers perfect or monoecious. Calyx of 2-4 sepals. 

 Corolla of 2-5 small petals, or wanting. Androecium of 1-8 relatively 

 large stamens. Gynoecium of 1 or of 2-4, sometimes united, carpels. 

 Ovary inferior. Stigmas 1-4. 



1. PROSERPINACA L. Herbs with creeping stems. Leaves alternate: 

 blades toothed or pectinate-pinnatifid, the lower ones the more finely dissected. 

 Flowers perfect, axillary. Sepals persistent. Petals wanting. Fruits angled 

 or winged, sessile. 



1. P. platycarpa Small. Leaves various, those on the lower part of the stem 

 with coarsely serrate or pectinate blades, those on the upper part of the plant 

 merely serrate; blades oblong, elliptic, or slightly broadened upward: sepals 

 deltoid or ovate-deltoid, barely 1 mm. long: fruits 4-5 mm. wide, constricted 

 above the middle, the angles thus abruptly dilated. Lime-sinks in hammocks 

 and pinelands. (Bah., Cuba.) MERMAID-WEED. 



Order AMMIALES. 



Herbs, shrubs, trees, or vines. Leaves alternate or opposite : blades 

 simple or compound. Flowers perfect, polygamous, or dioecious, often 

 borne in umbels. Calyx of typically 5 small petals, surmounting the 

 hypanthium. Corolla typically of 5 petals, or wanting. Androecium of 

 as many stamens as the sepals. Gynoecium 2-carpellary, or rarely several- 



