PLANTS OF SOUTHERN NEW JERSEY. 689 



d. Flowers 16-20 mm. broad. U. cornata. p. 689 



dd. Flowers 8-10 mm. broad. [/. juncea, p. 690 



cc. Scape filiform, zig-zag. [/. subulata, p. 691 



bbb. Corolla included in the calyx or absent. 



c. Flowers 2-6, capsule 1.5-2 mm. in diameter, plant 2-20 cm. high. 



U. virgatula, p. 690 

 cc. Flowers 1-2, about the size of a pin head, plant 2-5 cm. high. 



U. cleistogama, p. 691 

 aa. Branches or finely divided leaves floating or creeping on mud and bearing 

 numerous bladders. 



6. Scape bearing a whorl of leaves with inflated petioles, flowers yellow. 



U. inHata, p. 693 

 bb. Scape leafless or with a few minute scales. 



c. Leaves verticillate, flowers purple. JJ. purpurea, p. 693 



cc. Leaves crowded, pinnately divided, flowers, yellow, iD-20 mm. 

 troad. U. vulgaris americana, p. 694 



ccc. Leaves scattered, dichotomously divided. 



d. Cleistogamous flowers among the filiform leaves. 



U. clandestina, p. 692 

 dd. No cleistogamous flowers. 



e. Bladders mainly on leafless branches. 



f. Leaf segments linear, flat, U. intermedia, p. 693 



ff. Leaf segments capillary. U. fibrosa, p. 690 



ee. Bladders scattered among the filiform leaves. 



U. gibba, p. 692 



Utricularia cornuta Mich. Horned Bladderwort. 



PI. CXIL, Fig. 3. 



Utricularia cornuta Michaux, Fl. Bor. Am. I. 12. 1803 [Canada]. — Knies- 

 kern 22. — Britton 192. — Keller and Brown 294. 



Sandy swamps of the Pine Barrens ; frequent. 



The Utricularias are particularly characteristic of the New 

 Jersey pine barren bogs. Shallow ponds with sandy bottoms 

 and masses of aquatic vegetation floating in them are favorite 

 spots for the taller naked-stemmed species like this, U. juncea 

 and U. fibrosa, while the strictly floating forms are found in 

 deeper water in which great masses of living and decayed vege- 

 tation extend down for many feet. The present species is usually 

 almost or entirely devoid of leaves or bladders, but Mr. S. S. Van 

 Pelt collected a fine specimen at Toms River with a great mass 

 of slender, almost filiform, leaves attached to the base. Perhaps 

 they are present more frequently but detached in collecting. 



Fl. — Late June into August. 



44 MUS 



