6i6 



IIALORAGIDACEAE. 



Vol. II. 



6. Myriophyllum heterophyllum Michx. \'arious- 



Icavcil Waler-.Milluil. I'ig. 3086. 

 Myriophyllum heterophyllum Michx. Fl. Bor. Am. 2: 191. 1803. 



Floral leaves in whorls of 3's to 5's, linear, ovate or lanceo- 

 late, serrate or rarely entire, much longer than the flowers. 

 Submerged leaves subverticillate or scattered, crowded, 

 pectinate-pinnati'id, about 10" long, the divisions 6-10 pairs, 

 capillary; llowering spike elongated (sometimes 18' long); 

 petals 4; stamens 4, rarely 6; fruit i" long, and slightly 

 longer than thick; carpels 2-keeled on the back, their sides 

 convex, usually slightly scabrous. 



Ill ponds, Ontario and New York to Florida, west to Minnesota, 

 Texas and Mexico. 



Myriophyllum hippuroides Nutt.. with narrower floral leaves 

 and fruit slightly longer, a species of the Pacific United States, is 

 recorded from southern Ontario. 



7. Myriophyllum pinnatum (Walt.) B.S.P. 

 Pinnate Water-2^1ilfoil. Fig. 3087. 



Potamogeton pinnatum Walt. FI. Car. 90. 1788. 

 Myriophyllum scabratnin Michx. Fl. Bor. Am. 2; 190. i8oj. 

 Myriophyllum pinnatum B.S.P. Pre!. Cat. N. Y. 16. 1888. 



Leaves in whorls of 3's-5's. or sometimes ^scattered, 

 the floral ones linear, serrate or pectinate, 2i"-6" long, 

 gradually passing into the submerged ones which are 

 crowded, pinnately dissected, tlie divisions few and 

 capillary; spikes 4-8' long; petals purplish; stamens 

 4, very rarely 6 ; carpels strongly 2-keeled and sca- 

 brous on the back, separated by deep grooves, their 

 sides flat; mature fruit about i" long and somewhat 

 more than i" thick. 



In ponds. Massachusetts to Florida. Iowa, Missouri, Ne- 

 braska, Louisiana and Texas. 



8. Myriophyllum Farwellii Morong. Farwell's Water-IMilfoil. Fig. 3088 



M. Farwellii Morong, Bull. Torr. Club 18 : 146, 1891. 



Submerged ; leaves in whorls of 3's-6's. or scattered, 

 narrow, pinnately parted, the divisions finely capillary 

 in 5-7 opposite or subopposite pairs, with minute black 

 spines in the axils; flowers solitary in the axils of the 

 leaves; petals 4, purplish, oblong; pistillate flowers only 

 seen ; styles 4, short ; stamens 4. minute, abortive ; fruit 

 about l" long and i" thick; carpels crossed longitudi- 

 nally by 3 or 4 rough tuberculate or slightly toothed 

 ridges, 2 on the back and commonly i on each margin; 

 groove between the carpels shallow. 



In still water. Quebec to Michigan. Maine and New York. 



Myriophyllum proserpinacoides Gill., the Chilian water- 

 milfoil, or \vater-te.ither. with flowers on submersed stems, 

 introduced into aquatic tanks in a nursery at Bordentown, 

 New Jersey, and some years ago observed in a pond at 

 Haddonfield, New Jersey, does not appear to have become 

 established. 



Family loi. ARALIACEAE ^'ent, Tabl. 3 : 2. 1799. 

 GixsEXG Family. 

 Herbs, shrubs or trees, with alternate or verticillate (rarely opposite) leaves, 

 and perfect or polygamous flowers in umbels, heads, racemes or panicles. Calyx- 

 tube adnate to the ovary, its limb truncate or toothed. Petals usually 5, valvate 

 or slightly imbricate, sometimes cohering together, inserted on the margin of the 

 calyx. Stamens as many as the petals and alternate with them (rarely more), 

 inserted on the epigynous disk; filaments filiform or short; anthers ovoid or 

 oblong, introrse. Ovary inferior, i-several-celled ; styles as many as the cavities 

 of the ovary; ovules i in each cavity, pendulous, anatropous. Fruit a berry or 

 drupe. Seeds flattened, or somewhat 3-angled, the testa thin ; endosperm copious, 

 fleshy ; embryo small, near the hilum ; cotyledons ovate or oblong. 



