AQUATICS 123 



The leaves, under water, are pinnately parted into about 10 

 very narrow divisions. 



In ponds and ditches from Massachusetts to Pennsylvania. 



16. W^ater-marigold 



Bldens B4ckii. — Family, Composite. Color, yellow. Leaves, 

 those under water many, cut and divided into narrow, capil- 

 lary divisions ; those above, long, narrow, undivided. Thne, 

 autumn. 



A large-flowered species, found in slow streams and ponds. The 

 flowers are single, on long and slender stems. The seeds are 

 smooth nutlets, each with several long awns, spreading apart, and 

 barbed at their apex. 



17. Featherfoil 



Hoiionia inf/ata. — Family, Primrose. Color, white. Leaves, 

 crowded at the base of the cluster of flower-stalks, very much 

 dissected into thread-like divisions. Ti^ne, summer. 



Calyx, of 5 long, narrow divisions. Corolla, with short tube, 

 and spreading, 5-parted border. Stamens, 5. Capsule, many- 

 seeded. Stems often 2 feet long. 



Flowers whorled around the much-swollen joints of the hollow 

 peduncles, all springing from floating and rooting stems. 

 In pools and ditches from Massachusetts to the Gulf. 



18. Floating-heart 



Limn anthem urn lacunosum. — Family, Gentian. Color, 

 white. Leaves, round, heart-shaped, thick, on thread-like, 

 very long petioles. Time, June to August. 



Calyx, 5-parted. Corolla, tubular, wheel-shaped, the border 

 5-divided, with 5 glands at the fringed bases of the lobes. 

 Fruit, a many-seeded capsule. 



A plant rooting in mud in winter; in spring, sending up an 



