Htdrocottle. UMBELLIFER/E. 699 



1. HYDROCOTYLE. Toum. ; Lam. ill. t. 1^^ ; DC. prodr. 4. j>. 59. 



Margin of the calyx obsolete. Petals ovate, entire, acute, spreading ; the 

 point straight. Fruit flattened laterally. Carpels without vittn- : primary 

 ribs 5, filiform ; the dorsal and lateral ones often obsolete ; the inteniifdiate 

 ones enlarged. Seed carinately compressed. — Herbaceous (rarely suflrutes- 

 cent) plants, usually slender and aquatic, wiili creeping stems, and peltate or 

 cordate leaves. Umbels simple. Involucre lew-leaved. Flowers sessile 

 or pedicellate, white. — Natel-wort. 



^^1. H. Americana (Linn.) : very glabrous and shining ; leaves orbicular- 

 renifomi, somewhat lobed, doubly rrenate; umbels nearly sessile, capitate, 

 3-5-flowered ; fruit orbicular, 2-ribbed on each side. — Linn. I spec. 1. p. 

 234 ; Michx. ! fl. I. p. 162 ; Rich. Hydr.f. 10 ; EU. sk. 1. p. 34« ; Torr.! 

 fi.l. p. 303 ; DC. ! prodr. 4. p. 64. 



Wet shady places, Canada ! and Northern States ! to the mountains of 

 S. Carolina. June-Aug. — Stems filiform. Leaves thin, an inch or more 

 in width, obscurely 7-lobed. Flowers in very small axillarj' umbels, green- 

 ish, often tinged with purple. Fruit very minute ; the ribs filiform : inter- 

 vab smooth and flat. 



•'' 2. H. interrupta (Muhl.) : glabrous ; leaves orbicular, peltate, slightly 

 doubly crenate ; flowers in small capitate nearly sessile proliferous umbels ; 

 fruit acute at the base, 2-ribbed on each side. — Muhl. cat. p. 10 : Ell. ! sk. 

 1. p. 345: DC.f prodr. 4. p. 59. H. vulgaris, Michx.! Jl. 1. p. 161; 

 Pursh, fl. 1. p. 190 ; Hook. fl. Bor.-Am. 1. p. 2o7. 



Wet places, common in the Southern States ! Ne^' Bedford, Massachu- 

 setts, 3/r. T. A. Greene! California, CAam mo. — Stems creeping. Leaves 

 thin, 8-12 lines in diameter, sometimes with a slight sinus at die base : 

 petioles 2-3 inches long. Peduncles longer than the petioles: whorls or 

 umbels 4—8 flowered, on very short pedicels. Fruit nearly twice as broad 

 as long, abruptly acuminate at the base. — DistinguLshed from H. vulgaris 

 by the form of the fruit, which in that species is emarginate at the base. 



— ^ 3. H. umhellata (Linn.) : glabrous : leaves peltate, orbicular, emarginate 

 at the base, doublv crenate ; scape usually longer than the petioles: umbel 

 20-30-flowered, sometimes proliferous ; pedicels slender ; fruit dirlymous, 

 2-ribbed on each side. — Linn.! spec. 1. p. 234 : Rich. Hydr. t. 52, /. 3 ; 

 Ell! sk. 1. p. 346; Bigel Bost. ed. 2. p. 109; DC! p.odr. 4. p. 60. 

 H. umbellulata, Michx. ! fl. 1. p. 161. 



Overflowed boggy places, and around ponds, Massachusetts {Bieelow) 

 ai;d New York (near Albany, Beck c^ Tracy !) and on Long Island I to Flori- 

 da I and Louisiana I April-.June. — Stems creejjing or floating. Leaves 1-2 

 inches in diameter, coarsely crenate : petioles 2-8 inches long. Pedicels 

 3-5 lines long. Fruit somewhat tumid, emarginate at the base and sura- 

 mil. — To this doubtless belongs H. incrassatum, Raf. (not of Ruiz &(■ Pat. 

 H. fluitans, DC. I. c.) 



4. H. natans (Cyrillo) : glabrous, floating ; leaves orbicular-reniform, 

 with a narrow cordate sinus, obtusely and unequally 7-9-lobed, crenate ; 

 peduncles much shorter than the petioles : umbel capitate, .5-6-flowered ; 

 flowers on short pedicels. — " Cyr. pi. rar. Seap. 1. ^ 6" ; Rich. Hydr. t. 95, 

 /. 20 ; Cham, i^- Schlecht. in Linnaa, 1. p. 273 ; DC prodr. 4. p. 62. 



St. Francisco, California, Chamisso, Douglas ! — Leaves about an inch in 

 diameter, excentrically peltate, repandly toothed : petiole stout, about 6 

 inches long. Umbel one-third of an inch in diameter : peduncle at length 

 curved. — We have not seen the fruit. 



