I 



■ 



1 







I 



HALORAGEiE. V. Proserpikaca. VL Myriophyllum. 



703 



in ditches and ponds; and of Mexico in slow running water. W. H. Native of the west of France, in still water about 



Ell. sketch. 1. p. 181. Torr. ii. unit. st. 1. p. 161. P. palustris 

 van a, Michx. fl. bor. amer. 1. p. 76. Trixis, Mitch. 1. c. with 

 a figure. Trixis palustris, Gaertn, fr, 1. p. 115. 



Marsh Proserpinaca. Fl. July. Clt. 1818. PI. cr. 



2 P. PECTiNA TA (Lam. ill. 1. p. 214. t. 50. f. 1.) leaves all 

 pinnatifidly pectinated ; angles of nut blunt. It- W. H. Na- 



Nantes, and in Vascony. M. alternifolium, Steud. nom. 



Alternate-leaved Water-milfoil. PI. fl. 



4 M. verticilla'tum (Lin. spec. 1410.) leaves finely cut into 

 capillary opposite segments ; flowers in axillary whorls ; floral 

 leaves all pinnatifid, much longer than the flowers, and hardly 

 distinguishable from the other leaves. 1/ • W. H, Native of Eu- 



tive of South Carolina, Georgia, New Jersey, and Pennsylvania, rope and North America, in pools, lakes, and ditches, but never 



Ell. sketch. 1. p. 182. Torrey, fl. unit, st. 1, p. 162. P. palus- 

 tris /3, Michx. 1. c. Only a variety of the preceding according to 



Michx, but according to Lamarck, Elliott, and Torrey it is a 

 proper species. 



Pectinate -\ed^ved. Proserpinaca. Fl. July, Aug. Clt. 1822. 

 Pl.cr. 



in running water. Smith, engl. bot. 218. — Clus.hist. 2. p. 252. 



Var, /3, I'lmbsum (Hect. in litt.) lobes of leaves linear, acute, 

 and regular. If . H. Native of Europe, in almost dry places. 



JFAor/ec?"flowered Water-milfoil. Fl. Ju. Aug. Brit. PI. fl. 



5 M. Quite'nse (H. B. et Kunth, nov. gen. amer. 6. p. 89.) 

 leaves finely cut into filiform lobes, about 15 lobes on each side. 



Cult. These plants should either be grown in large pans of If . W. S. Native of the Andes about Quito, in the river Guan- 

 } water, with an inch or two of mould in the bottom for the roots to cabamba. 



run in, or in pots set in pans of water, or they may be grown in 

 ponds. They require some care and shelter to preserve them 

 through the winter in Britain. 



VI, MYRIOPHY'LLUM (from ^vpioc, myrios^ a myriad, 

 ^x\ifj)vX\or, pkylloVy a leaf; in reference to the numerous divi- 

 sions of the leaves), Vaill. act. acad. par. 179. t. 2. Lin. 

 gen. no. 1066. Geertn. fr. 1, t. 68. Lam. ill. t. 775. D. C. 

 prod. 3. p. 68. — Pentapterophyllum, Dill. nov. gen.7. — Pentap- 

 teris, Hall. helv. 1. p. 454. 



Lin. syst. Monoe'ciay Tetrdndrla, and Octdndriay Tetragynia. 

 Flowers monoecious, rarely hermaphrodite. Male. Calyx 4- 

 parted. Petals 4, caducous, ovate, alternating with the calycine 

 lobes. Stamens 4-6 or 8. Female. Calyx adhering to the 

 ovarium ; limb 4-lobed. Petals none. Fruit separable into 4 

 ^ard, 1 -seeded, indehiscent nuts. Albumen almost absent. 

 Floating aquatic herbs, rising above the water to flower. Leaves 

 finely cut, opposite or verticillate. Flowers small, disposed in 

 axillary whorls ; or in whorled spikes, in consequence of the 

 upper leaves being almost abortive ; upper ones male, lower ones 

 female. 



Sect. I. Penta'pteris (from 7r£vr»/, pente, five, and Trrepoy, 



D. C. prod. 3, p. 



Leaves 



pteron, a wing ; application not evident). 



68. Flowers usually monoecious. Anthers oblong. 



(Opposite or often in whorls. 



Quito Water-milfoil. PL fl. 



6 M. I'ndicum (Willd. spec. 4. p. 407.) leaves in whorls, 

 lower ones finely cut into capillary segments, upper ones lanceo- 

 late, cuneated, rather cut at the apex ; flowers axillary, verticil- 

 late. 2/. W. S. Native of Ceylon and Coromandel. The 

 flowers are said to be hermaphrodite. 



Indian Water-milfoil. PI. fl. 



7 M. ELATiNoiDES (Gaud. fl. mal. p. 17. ann. sc. nat. 5. p. 

 105.) leaves 4 in a whorl, lower ones cut into capillary segments, 

 upper ones pinnatifid, toothed or entire, oblong-lanceolate ; 

 flowers dioecious, female ones axillary, %> W. F. Native of 

 the Maclove and Falkland Islands. Male flowers unknown. 



Elatine-Uhe Water-milfoil. PI. fl. 



8 M. terna'tum (Gaud. 1. c.) leaves 3 in a whorl, lower ones 

 cut into capillary lobes, upper ones oblong, quite entire ; flowers 

 axillary, upper ones male, octandrous, lower ones female. If . 

 W. F. Native of the Falkland Islands. 



TVrwa/e-leaved Water-milfoil. PI. fl. 



9 ]Vt. AMPHi BiuM (Labill. nov. hoU. 2. p. 70. t. 220.) leaves 

 opposite, obovate, entire; flowers axillary, solitary. If . B, G. 

 Native of Van Dieman's Land, in marshes. A creeping herb, 

 with the habit of Callitriche. Flowers monoecious, male ones 

 octandrous. 



Amphibious Water-milfoil. PI. cr. 



« « 



Male flowers hexandrous. 



Malefl 



10 M. heterophy'llum (Michx. fl. bor. amer. 2. p. 191.) 



iviaie jiowers ociunuruua, , . , , • -n ^ -i ^ ^- „i 



•^ „ , . leaves in whorls, cut into capillary segments ; spikes termmaJ, 



I M. spicVtum (Lin. spec. 1409.) leaves finely cut into ca- almost naked ; floral leaves opposite, ovate, acute, sharply ser- 



* "i. sj-icA TUM (^i^m. spec. LtKJv.) icavca .i^.^v -"" ""r aloiost nakctl ; floral leaves opposite, ovai< 



Pi'lary segments, disposed in whorls ; flowers m whorled inter- ^.^^^j^ exceeding the flowers. Tf. W. H. 



^"Pted, almost leafless spikes ; floral leaves shorter than the ^^^ Georgia, in still water. Potamog^ton verticillatum, Walt. 



^wers, lower ones a little serrated, the rest quite entire. % 

 "• H. Native of Europe and North America, in ditches, lakes, 

 ^nd pools, never in flowing water ; plentiful in Britain. Fl. dan. 

 *^81. Smith, engl. bot. t?83. Schkuhr, handb. t. 296. Petals 

 i-eddish. 



car. p. 90. 



Variable-leaved Water-milfoil. 



PI. fl. 



** 



* Male flowers tetrandrous. 



Water 



Britain. PL fl. 



'J. « T-ai-c.-iuiiiun. Fl. June, Aug. 



. 2 M. PECTiNA^TUM (D. C. fl. fr. suppl. 529.) leaves finely cut 

 into capillary segments, disposed in whorls ; flowers m whorled, 

 'nterrupted, almost leafless spikes ; floral leaves a little longer 

 'tian the flowers, all pectinately serrated. l^.W. H. Native about 

 *Iontpelier, in still water, and Denmark, and probably through 

 »ie whole of Europe. Habit of the preceding species, but dil- 

 *^"ng in the floral leaves. It appears to be intermediate between 

 ^f-spicatum and M. verticillatum. 



Pectinate-\ea\ed Water-milfoil. PI- &■ 



3 M. 



11 M. tubercula'tum (Roxb. fl. ind. 1. p. 471.) leaves in 

 whorls, lower ones pinnatifid ; spikes almost naked ; bracteas 

 oblong, a little toothed at the apex ; carpels tubercular, acute on 

 the back. 11. B. S. Native of humid places and on the shores 

 of lakes, near Calcutta. Flowers pink. 



Tubercled-frmted Water-milfoil. PI. fl. 



12 M. interme^dium(D. C. prod. 3. p. 69.) leaves m whorls, 

 lower ones cut into filiform lobes ; floral ones oblong-linear, ser- 



rated, acuminated at both ends ; carpels rather tubercular, blunt 

 on the back. "2; . W. S. Native of the East Indies. Ammannia 



«;. disposed ,„ „WU > flcvers in nearly leafless_ sp,k_es, aUer- ^yf^Jj^-^f^J^t-Jm!' l\T ' 



' ^*^i*waeu ni wnoris ; nowers ui iik:*xii^ l,.«**^- — ^--- . 



»?tf. lower ones in fascicles, the rest solitary ; lower floral leaves 

 P'nnatifid, exceeding the flowers, upper ones entire, short. V • 



13 M. tetra'ndkum (Roxb. fl. ind. 1. p. 470.) leaves dis- 



