Myriophyllum. HALORAGE^. 243 



species. Floral leaves about half an inch long, of a firm texture ; upper ones serrate, lowest 

 ones pectinately toothed. Flowers whorled, in the axils of the upper leaves. Anthers linear- 

 oblong. Stigmas woolly, purple. 



Ponds and slowly flowing streams ; common in the western parf of the State. July - 

 September. 



^ 3. Flowers tetrandrous : carpels not ridged on the back : leaves alternate, or almost wanting. 



4. Myriophyllum ambiguum, Nutt. Polymorphous Water Milfoil. 



Submersed leaves cut into capillary segments ; the emersed ones pectinate ; upper floral 

 ones linear, tapering into a short petiole, .sparingly incised or toothed, sometimes entire ; 

 flowers mostly perfect ; petals oblong ; carpels smooth and even. — DC. prodr. 3. p. 70 ; 

 Torr. ^ Gr. fl. N. Am. 1. p 530. 



var. 1 nutans : stem floating ; emersed leaves narrow, rigid, serrate or pectinate, the floating 

 ones capillary. DC. I. c. ; Torr. <^ Gr. I. c. M. ambiguum, Nutt. gen. 2. p. 212; Torr. 

 comp. p. 355. 



var. 2. capillaceum : leaves all immersed and capillary. Torr. <^ Gr. 1. c. M. capillaceum, 

 Torr. comp. I. c. 



var. 3. limosum : small ; stem procumbent and rooting ; leaves all narrow, rigid, sparingly 

 toothed or pinnately cut into several narrow lobes, sometimes nearly entire. Nutt. I. c. ; Torr. 

 comp. I. c. ; DC. I. c. ; Torr. <^ Gr. I. c. M. procumbens, Bigel.jl. Bost. p. 346. Purshia 

 humilis, Raf. in New-York med. rep. 2. p. 361. 



A very variable plant. The floating forms have long slender stems, and the leaves are cut 

 into very narrow attenuated segments. In var. 3. the stems creep in the mud, and are only 

 from 2 to 6 inches long, forming large green patches on the margins of ponds. Flowers very 

 small, reddish. Anthers oblong. Stigmas pencillate. 



Ponds and miry places on Long Island. July - August. 



5. Myriophyllum tknellum, Bigel. Leafless Water Milfoil. 



Stems (scapes) almost leafless, arising from a prostrate rhizoma ; bracts minute, entire ; 

 flowers alternate ; petals linear-oblong ; carpels smooth and ewn. — Bigel. Jl. Bost. p. 346 ; 

 Torr. comp. p. 355 ; DC. prodr. 3. p. 69 ; Hook. fl. Bor.-Am. 1. p. 216 ; Torr. ^ Gr. fl. 

 N. Am. 1. p. 530. 



Rhizoma slender, rooting in the mud, and throwing up several scapes or flowering branches 

 4 — to inches high, the lower part submerged. Leaves reduced to mere little alternate scales. 

 Flowers moncEcious, very small. Bracts oblong, obtuse, mostly rather longer than the flower. 

 Calyx-segments very short, acute. Petals purplish. Anthers oblong. Stigmas at length 

 feathery. 



Borders of pords and small streams of water. Northern part of the State. Peach Pond, 

 Westchester county {^Dr. Mead). July - August. 



31» 



