701 



HALORAGEyE. VI. MYRIOPUYLLUM. VII. CALLITRICHE. 



posed in whorls, cut into capillary segments ; spikes almost leaf- 

 less; bracteas pinnatifid ; carpels suioothish, blunt on the back. 

 "U. . W. S. Native of the East Indies, in pools filled by the 

 rain, and where it is called Necrla-pamamm by the Tclingas. 

 Flowers white. 



Tctrandrous Water-milfoil. PL fl. 



14 M. scABRATUM(Michx. fl. bor. amer. 2. p. 190.) leaves in 

 whorls, cut into linear distant lobes ; flowers in axillary whorls ; 

 bracteas much like the leaves ; fruit 8-angled ; angles tuber- 

 cular. I/ . W. H. Native of Carolina, Georgia, and North 

 California, in stagnant water. Potamogeton pinnatum, Walt, 

 fl. car. 90. Carpels more closely connected than in any of the 

 other species. 



Scabrous-fruited Water-milfoil. PI. fl. 



15 M. TENE'LLUM (Bigel. fl. bost. ed. 2. p. 346. D. C. 

 prod. 3. p. C9.) stem simple, almost leafless, erect, rooting at 

 the base ; leaves scale-formed, alternate, entire ; flowers in the 

 axils of the upper leaves, as well as disposed in interrupted spikes, 

 having the flowers alternate. I/. W. H. Native of North 

 America, in watery places about New Cambridge, and in New- 

 foundland. Hylas aphyllus, Bigel. mss. M. nudum, Lapy- 

 laie, mss. 



Slender Water-milfoil. PL fl. 



SLCT. II. PTILOPHY'LIUM (from TrriXoc, ptilon, a soft feather, 

 and <f>v\\oi>, phyllon, a leaf; in reference to the narrow segments 

 of the leaves.). Nutt. gen. amer. 2. p. 211. Purshia, Rafin. 

 but not of D. C. Flowers all hermaphrodite, tetrandrous. Pe- 

 tals wanting. Anthers roundish. Stigmas minute, pubescent. 

 Leaves alternate. 



16 M. AMBI'GUUM (Nutt. 1. c.) leaves alternate, petiolate, 

 lower ones cut into capillary lobes, upper ones into linear lobes, 

 uppermost ones almost entire or serrated. If., W. H. Native 

 of North America, in ponds in New Jersey. 



I'ar. a, natans (D. C. prod. 3. p. 70.) stems floating, dichoto- 

 mous. l/.W. H. Native of Jersey, New York, floating in water. 



Var. /3, limbsum (Nutt. L c.) stem rooting, erect ; leaves stiff", 

 almost entire or trifid ; lobes setaceous, acute. If: . B. H. Na- 

 tive on the banks of the Delaware, and in New Jersey. 



Ambiguous Water-milfoil. PL fl. 



Cult. All the species of Myriophyllmn being aquatic plants 

 if cultivated should be grown in ponds, in which they may be 

 either planted or the seeds thrown in. Small parts of the tro- 

 pical species should be taken up in the autumn, planted in a pan 

 of water, and then to be placed in the stove, in order to preserve 

 them in a living state during the winter ; and in the course of the 

 April or May next season may again be returned to the pond in 

 the open air, where they will thrive much better than if grown 

 all the year round in pans of water or cisterns in a hot-house. 

 None of the species are, however, worth growing except in 

 botanical gardens. 



Tribe II. 



CALLITRICHI'NE^E (plants agreeing with Callitriche in 

 important characters). Link, enum. hort. berol. 1. p. 7.. D. C. 

 prod. 3. p. 70. Limb of calyx hardly discernible. Petals 

 wanting. Stamen 1, rarely 2. Fruit 4-celled, 4-seeded (f. 

 103. c.). Aquatic herbs, with opposite leaves, and insignificant 

 axillary solitary flowers. 



VII. CALLI'TRICHE (a name given by Pliny to a plant 

 which had the colour of beautiful hair, from KU\\OC, kallos, beau- 

 tiful, and 0pi rpi^os, thrix triclios, a hair, but the present genus 

 has nothing to do with the plant of Pliny). Lin. gen. 13. Lam. 

 ill. t. 5. Gaertn. fruct. 1. p. 330. t. 68. A. Richard, diet, 

 class. 3. p. 59. D. C. prod. 3. p. 70. Stellaria, Dill. gen. p. 

 119. t. 6. but not of Lin. 



LIN. GEN. Mondndria, Monogynia, or Polygamia, Monce'cia. 



Flowers usually bisexual, monoecious, with 2 opposite petaloid 

 bracteas at the base of each flower. Styles 2 (f. 103. a.), subu- 

 late. Smooth annual aquatic herbs. 



1 C. VB'RNA (Lin. spec. 2.) leaves triple-ribbed, the upper- 

 most crowded and obovate ; margin of fruit obtuse ; fruit sessile. 

 G. W. H. Native throughout the whole of Europe, and of 

 North America, in ditches and slow running streams ; plentiful 

 in Britain. Smith, engl. bot. t. 722. Wahl. fl. lapp. 2. Wallr. 

 ann. hot. p. 1. C. aquatica var. Smith, fl. brit. 1. p. 8. C. 

 sessilis, Vahl. var. D. C. fl. fr. ed. S. no. 3655. C. pollens, 

 Goldb. act. mosc. 5. p. 118. Gray, brit. pi. 2. p. 555. 



Var. a, vulgaris (D. C. prod. 3. p. 70.) leaves all obovate. 

 C. verna, Fl. dan. t. 129. C. aquatica, Huds. fl. ang. p. 397. 



I'ar. ft, intermedia (Hoffm. fl. germ. 1791. p. 2.) lower leaves 

 linear, obtuse or emarginate, upper ones oval. Schkuhr, handb. 

 t. J. Pursh, fl. amer. sept. 1. p. 3. C. aquatica, Bigel. fl. 

 bost. p. 2. 



Var. y, linearis (D. C. 1. c.) leaves all linear, upper ones 

 scarcely obovate, 3-nerved. In ditches about Moscow. Stems 

 short, creeping. 



Var. S, stellala (Hopp. bot. tasch. 1792. p. 758.) leaves all 

 oval ; stems short. C. aestivalis, Thuill. fl. par. p. 2. 



Var. t, ccEspilosa (Schultz, prod, starg. p. 3.) leaves all oval, 

 stirRsh, small ; stems short, stellately spreading. In very shal- 

 low water or among mud. C. verna minima, Wallr. ann. bot. 

 p. 1. 



I'ar. , rigldula (Wallr. in litt. D. C. prod. 3. p. 70.) leaves 

 all ovate-oblong, opaque, stiffish ; stems rooting. Native of 

 Thuringia. 



Var. $, tenuifulia (Pers. ench. 1. p. 5.) leaves all linear, 

 upper ones 3-nerved. In humid, hardly inundated places. 



To this polymorphous species the following names probably 

 appertain, viz. C. dioica, Pentag. inst. bot. 2. p. 10. C. Brutia, 

 Pentag. I.e. C. andrdgyna or C. hermaphrodita. Schum ; but 

 these are extremely doubtful. 



Spring Water-starwort. Fl. April, Oct. Britain. PL fl. 



2 C. PEDUNCULATA (D. C. fl. fr. ed. 3. no. 3656.) lower 

 leaves linear, upper ones oblong, 3-nerved ; fruit pedicellate ; 

 margin of carpels obtuse. Q. W. H. Native of France, in 

 stagnant water ; also of Scotland, in ditches. Hook, in engl. 

 bot. suppl. 2606. Stalk of fruit from 1 to 3 lines long, upper . 

 ones the shortest. 



Stalked-fmhed Water-starwort. 



3 C. AUTUMNA'LIS (Lin. spec, 

 p. 2.) leaves linear, abrupt, sin- 

 gle ribbed, uniform ; fruit ses- 

 sile ; margin of fruit membra- 

 nous. O-W.H. Native through- 

 out Europe and North America, 

 in clear pools, lakes, and slow 

 running streams. Smith, engl. 

 bot. t. 722. f. 2. C. aquatica, 

 var. Smith, fl. brit. 1 . p. 8. C. 

 sessilis var. D. C. fl. fr. C. an- 

 gustifolia, Hoppe, bot. tasch. 

 1792. p. 155. C.linearis, Pursh, 

 fl. amer. sept. 1 . p. 3. C. virens, 

 Goldb. act. mosc. 5. p. 119. 

 Gray. brit. pi. 2. p. 556. Gmel. 

 sib. 3. t. 1. Flowers often her- 

 maphrodite. Cells of leaves very 



fine. This plant is distinguished by Us narrower leaves and 

 deeper green colour at first sight. ^k 



Autumnal Water-starwort. Fl. June, Oct. Britain. PL fl. 



4 C. TERRE'STIUS (Rafin. med. spec. xi. p. 358.) leaves ap- 

 proximate, short, oblong, obtuse, rather succulent ; fruit sessile, 



Fl. Apr. Oct. Scotl. PL fl. 

 FIG. 103. 



