PLANTS OF SOUTHERN, NEW JERSEY. 579 



e. Plant hirsute, capsules bristly pubescent. L. hirtella, p. 581 

 ee. Plant glabrous or nearly so, capsules glabrous. 



L. alternifolia, p. 582 

 dd. Stamens 8. 



e. Stamens equal in length, capsule cylindrical. 



f. Tall, 3-25 dm. high, flowers 25-50 mm. broad, in a 

 leafy bracted terminal spike. Oenothera biennis, p. 583 

 //. Low or decumbent, 1-5 dm. high, flowers 12-30 mm. 

 broad, axillary. 



g. Leaves repand dentate, the lower pinnatified, plant 

 silvery appressed-pubescent. O. humifusa, p. 583 

 gg. Leaves oblong or oval lanceolate, sinuate dentate 

 often pinnatifid, plant glabrous or sparingly pu- 

 bescent. O. laciniata, p. 583 

 ee. Stamens unequal in length, the alternate ones longer, 

 capsule more or less club-shaped. 

 /. Flowers 10-25 mm. broad, plant 2-6 dm. high. 



Kneifha pumila, p. 585 

 //. Flowers 25-50 mm. broad. 



g. Capsule glabrous or sparingly pubescent, with 



glandular hairs. K. fruticosa, p. 585 



gg. Capsule pubescent, with fine incurved glandless 



hairs. K. linearis, p. 584 



ggg. Capsule pubescent, with numerous straight 



spreading glandless hairs. 



K. longipedicellata, p. 584 

 ccc. Petals pink, whitish or purple. 



d. Fruit a long slender pod splitting lengthwise, seeds with long 

 downy coma. 

 e. Flowers 15-30 mm. broad, purple, in showy terminal 

 racemes. CJiamanerion angustifolium, p. 582 



ee. Flowers 4-6 mm. broad, pink or white. 



/. Leaves linear or lanceolate, entire or nearly so; stem 

 pubescent, with straight spreading hairs. 



Bpilobium molle, p. 582 



ff. Leaves lanceolate, serrate, stem somewhat canescent 



above with incurved hairs. B. coloratiim, p. 583 



dd. Fruit ovoid, hard, nut-like, 1-4 seeded, flowers 8-10 mm. 



broad; white or pinkish, turning reddish as they fade. 



Gaura biennis, p. 585 



LUDWIGIANTHA Small. 

 Ludwigiantha arcuata (Walt.). Creeping Ludwigia. 



Ludwigiantha arcuata Walter, Fl. Car. 89. 1788 [Carolina]. 



Coast strip; rare and local. 



Mr. Bayard Long, who discovered this interesting- plant, has 

 furnished me with the following information concerning it: 

 "On the northern part of the New Jersey coast there are numer- 

 ous fresh water ponds of appreciable dimensions, but on Long 



