GENUS 37. 



CARROT FAMILY. 



649 



Leaves nearly orbicular, cordate, or reniform, not peltate. 

 Flowers umbellate. 



Leaves 5-g-lobed ; umbels nearly sessile. 

 Leaves 3-7-clef t ; umbels long-peduncled. 

 Umbels capitate, the beads peduncled. 



i. Hydrocotyle umbellata L. Umbellate or 

 Many-flowered Marsh-Pennywort. Fig. 3154. 



Hydrocotyle umbellata L. Sp. PL 234. 1753. 



Glabrous, stem creeping, several inches long, the 

 subterranean branches tuberiferous. Petioles slender, 

 erect, or ascending, i'-6' long; leaves peltate, orbicular, 

 or broader than long, sometimes cordate at the base, 

 i'-2' wide, crenately /-n-lobed, the lobes broad, not 

 deep, mostly crenulate ; peduncles elongated ; umbels 

 simple or rarely with a proliferous extension ; pedicels 

 slender, 2"-6" long; mature fruit notched at both ends, 

 i"-ii" broad, not quite as long; intermediate ribs 

 corky-thickened; dorsal rib obtuse. 



In swamps and low grounds, eastern Massachusetts to 

 Florida and the West Indies, Minnesota. Texas and Mexico. 

 Also in South America and South Africa. June-Sept. 

 Water-navelwort. Water-grass. 



4. H. americana. 



5. H. rannnculoides. 



6. H, rotundifolia.. 



2. Hydrocotyle Canbyi C. & R. Canby's 

 Marsh-Pennywort. Fig. 3155. 



Hydrocotyle umbellata var. ambigua A. Gray, Man. 



Ed. 5, 190. 1867. Not H. ambigua Pursh, 1814. 



H. Canbyi Coult. & Rose, Bot. Gaz. 12: 103. 1887. 



Stem creeping, sometimes 12' long, the sub- 

 terranean branches tuberiferous. Petioles short, 

 or elongated; leaves peltate, orbicular or nearly 

 so, i'-ii' wide, with 7-11 shallow broad mostly 

 crenulate lobes ; peduncles elongated ; inflores- 

 cence mostly proliferous, rarely simply umbellate; 

 verticils 3-io-flowered ; pedicels i"-2" long, or 

 some of them rarely 4" long; fruit about i" long 

 and 2" broad, slightly notched at both ends when 

 mature, much flattened, the intermediate ribs 

 corky-thickened, the dorsal one very obtuse. 



In moist ground, New Jersey to Maryland. The 

 record of this species from Florida in our first edi- 

 tion should apply to H. australis. June-Sept. 



3. Hydrocotyle verticillata Thunb. 



Whorled Marsh-Pennywort. 



Fig. 3 r 56. 



H. verticillata Thunb. Diss. 2: 415. pi. 3. 1798. 

 Hydrocotyle interrupta Muhl. Cat. 30. 1813. 



Similar to the two preceding species. In- 

 florescence always proliferous, i'-2' long; 

 verticils 2-6-flowered ; pedicels very short, 

 usually less than i" long; fruit about i" long, 

 ii"-2" broad, rounded or truncate at each 

 end, not notched ; intermediate ribs of the 

 carpels filiform, not corky-thickened, the dor- 

 sal one acute. 



In moist soil, Massachusetts to Florida, mainly 

 near the coast, west to Texas. Arkansas and south- 

 ern California, and in the West Indies, Central 

 and South America. June-Sept. 



Hydrocotyle australis Coult. & Rose has fruit- 

 ing pedicels i"-2" long, but is otherwise similar to 

 this species. It ranges from southeastern Vir- 

 ginia to Florida. Cuba. 



