704 



HALORAGEiE. VI, Myriopiiyllum. VII. Callitriche* 



posed in whorls, cut into capillary segments ; spikes almost leaf- Flowers usually bisexual, monoecious, with 2 opposite petaloid 



less ; bracteas pinnatifid ; carpels snioothish, blunt on the back. bracteas at the base of each flower. Styles 2 (f. 103. a.), subu- 



7(. W. S. Native of the East Indies, in pools filled by the late.— Smooth annual aquatic herbs. 

 rain, and where it is called Neerla-parnarum by the Telingas. 

 Flowers white. 



Tetrandroxis Water-milfoil. PL fl. 



14 M. scABRA^TUM(Michx. fl. bor. amer. 2. p. 190.) leaves in 

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



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

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

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

 North America, in ditches and slow running streams ; plentiful 

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



bracteas much like the leaves; fruit 8-angled ; angles tuber- ann. bot. p. 1. C. aquatica var. Smith, fl. brit. 1. p. 8. C. 

 cular. %. W. H. Native of Carolina, Georgia, and North s^ssilis, Vahl. var. D. C. fl. fr. ed. S. no. 3655. C. pallens, 

 California, in stagnant water. Potamogeton pinn^tum, Walt. Goldb. act. mosc. 5. p. 118. Gray, brit. pi. 2. p. 555. 

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

 other species. 



Scahroiis-ix\x\te^ Water-milfoil. 



PI. fl. 



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. 

 Var, /3, intermedia (Hoffm. fl. germ. 1791. p. 2.) lower leaves 



15 M. tene'llum (Bigel. fl. host. ed. 2. p. 346. D. C. linear, obtuse or emarginate, upper ones oval. Schkuhr, handb. 

 prod. 3. p. G9.) stem simple, almost leafless, erect, rooting at 

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



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



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



W. H. Native of North 



having the flowers alternate. 



1/. 



America, in watery places about New Cambridge, and in New- short, creeping. 



host, p. 2. 



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

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



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



laie, mss. 



Slender Water-milfoil. PI. fl. 



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

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



Var. e, ccespitosa (Schultz, prod, starg. p. 3.) leaves all oval, 

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



Sect. II. Ptilophy'llum (froni TrnXov, ptilon, a soft feather, j^^ ^^^^^ ^^ ^^^^^ ^^^^ q ^g^na minima, Wallr. ann. bot. 



and <f>vWoyy phyllony 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. 1/ . W. H. Native 

 of North America, in ponds in New Jersey. 



Var. a, nata7is (D. C. prod. 3. p. 70.) stems floating, dichoto- 

 raous. % . 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. 1^. B. H. Na- 

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



Ambiguous Water-milfoil. PI. fl. 



Cult. All the species of Myriophyllum 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 



p. 1. 



Var. ^, rigidula (Wallr. in litt. D. C. prod. 3. p. 70.) leaves 



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



Thuringia. 



Van ^, ienuifoUa (Pers. ench. 1. p 

 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. 1. c. 



5.) leaves all linear, 



C. androgyna or C. hermaphrodtta. Schum ; but 



these are extremely doubtful. 



Spring Water-starw^ort 



2 C. PEDUNCULA^TA 



Britain. PI. A- 



Fl. April, Oct. 



fl. fr. ed. 3. no. 3656.) lower 



(D. C. 



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



" Native of France, m 



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



Stalk of fruit from 1 to 3 lines long, upper 



margin of carpels obtuse. ©. W. H. 



bot. suppl. 2606. 

 ones the shortest. 



Stalked- fruited Water-starwort. 



$ C. AUTUMNA^LIS (Liu. SpCC. 



Fl. Apr. Oct. 



FIG. 103. 



Scotl. PI fl. 



, • ,. . . 1 • .1. • 1*1 - « . P* 2.) leaves linear, abrupt, sin- 



them in a living state during the winter ; and in the course of the ^j^ 4bed, uniform ; fruit ses- 



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. 



CALLlTRlCHlNEiE 



important characters). 



3, p. 70. Limb of calyx hardly discernible. 



Stamen 



prod, 

 wanting 



Link, eniim. hort. berol. 1. p. 7. D. C. 



Petals 



sile ; margin of fruit membra- 

 nous. ©.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. 



1, rarely 2. Fruit 4-celled, 4-seeded (f. 1792. p. 155. C. linearis, Pursh, 



103. c). — Aquatic herbs, with opposite leaves, and insigniflcant 

 axillary solitary flowers. 



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

 which had the colour of beautiful hair, from fcaWoc, kallos^ beau- 

 tiful, and Qpii rptypg^ thrix trichosy a hair, but the present genus 



119. 



ill. 



ny). Lin. gen. 13. 



Lam. 



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

 Goldb. act. mosc. 5. p 

 Gray. brit. pL 2. p. 556. — Gmel. 

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

 maphrodite, 

 fine. 



t. 5. Gsertn. fruct. 1. p. 330. t. G8. A. Richard, diet, 

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

 119. t. 6. but notof Lin- 



LiN. GEN. Mondndrtd, Monosynia. ox Polysamia. Moncecia. 



Cells of leaves very . 



This plant is distinguished by its narrower leaves and 



deeper green colour at first sight. . - •oi fl 



Autumnal Water-starwort. Fl. June, Oct. Britain. Ph "• 

 , 4 C. terre'stris (Rafin. med. spec. xi. p. 358.) leaves ap- 

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



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