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Gen. t. 31.) — Clafs and order, Hexandr'ia Trtgynia. Nat. 

 Ord. Tripetalotdex, Linn. Junci, JufT. AUfmaces, Brown. 



Gen. Ch. Cal. Perianth inferior, of three roundilh, 

 obtufe, concave, deciduous leaves. Cor. Petals three, 

 ovate, concave, obtufe, fimilar to the calyx. Stam. Fila- 

 ments fix, very fhort ; anthers at the back of the filaments, 

 ftiorter than the corolla. Pijl. Germen fuperior, large ; 

 ftyles none ; ftigmas three or fix, reflexed, feathery. Perk. 

 Capfule ovate-oblong, obtufe, with as many cells as there 

 are ftigmas, burfting at the bafe, with acute valves. Seeds 

 folitary, oblong, ereft. 



Obf. Gxrtner and Brown, perhaps more juftly, confider 

 the fruit as an aflemblage of three or fix fingle-feeded cap- 

 fules, without valves. Analogy confirms this opinion. 



EflT. Ch, Calyx of three leaves. Petals three, like the 

 calyx. Styles none. Capfule fuperior, of three or fix 

 cells, feparating at the bafe. Seeds fohtary. 



1. T. pah^re. Marfh Arrow-grafs. Linn. Sp. PI. 



482. Willd. n. I. Fl. Brit. n. i. Engl. Bot. t. 366. 

 Fl. Dan. t. 490. Leers 92. t. 12. f. 5. Purlh n. 2? 

 (Gramen aquaticum fpicatum; Ger. Em. 13.; — Capfules 

 of three cells, nearly linear ; tapering at the bafe. Stigmas 

 ereft. — Native of boggy inundated places, in various parts 

 of Europe, particularly towards the North. Common in 

 England, flowering in July. The root is fibrous, perennial. 

 Leaivs radical, two-ranked, ereft, fheathing, hnear, chan- 

 nelled, fmooth, fix inches high. Flower-Jlalk radical, fim- 

 ple, round, or partly angular, taller than the leaves, ter- 

 minating m a long, linear, fimple, flender clujler, of fniall 

 green jiowers. Thefe are fucceeded by upright prifmatic 

 capfuhs, nightly elliptical, half an inch long, feparating at 

 the bafe into three (harp pomts. 



2. T. bulbofum. Bulbous Arrow-grafs. Linn. Mant. 

 226. Willd. n. 2. Jacq. Ic. Rar. t. 454. — Capfules of 

 three cells, linear -lanceolate, tapering' upwards. Stigmas 

 fpreading. Root bulbous. — Native of the Cape of Good 

 Hope. Smaller than the foregoing, with fhorter leaves, 

 and ovate bulbous roots, concealed by the numerous fibrous 

 remains of old leaves. Germen with three fpreading points, 

 each crowned by a little aarryjiigma. Capfule rounded at 

 the bafe. 



3. T. mexicanum. Mexican Arrow-grafs. Kunth Nov. 

 Gen. and Sp. v. i. 244. — Capfules of fix cells. Spike 

 very long. Leaves cylindrical. Root tuberous. — Native 

 of moid expofed fituations in New Spain, flowering in Ja- 

 nuary. Root perennial, oblong, horizontal, the thicknefs 

 of a fwan's quill, very denfely clothed with the rudiments 

 (rather probably the remains) of leaves. All the leaves 

 are radical, linear, narrow, bluntifli, fmooth, two or tliree 

 inches long, fhealhiiig at the bafe. Stalk ereft, round, 

 fmooth, fix or eight inches high, including its clujler, which 

 meafures half as much. Stamens fix. Stigmas red. Two 

 or three of the cells, or capfules, are generally abortive. 

 Kunth. 



4. T. procerum. Tall Arrow-grafs. Brown n. I. — 

 " Capfules of fix cells. Stigmas linear, recurved. Spike 

 ■very long. Leaves linear, rather cylindrical at the bafe." 

 — Found by Mr. Brown, near Port Jackfon, as well as in 

 the tropical part of New Holland. 



5. T. maritimum. Sea Arrow-grafs. Linn. Sp. PI. 



483. Willd. n. 3. Fl. Brit. n. 2. Engl. Bot. t. 255. 

 Purih n. I. Fl. Dan. t. 306. (Gramen marinum fpica- 

 tum ; Lob. Ic. 1 6. G. fpicatum alterum ; Ger. Em. 20. ) 

 — Capfules eUiptical, of fix cells, rounded at the bafe. 

 Leaves femicylindrical. Root tuberous. — Native of falt- 

 marfhes, in England and other parts of Europe, as well as 

 North America, flowering throughout the fummer. Much 



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ftouter in habit than our other Britifh fpecies, n. I, from 

 which alfo it is readily known by its fhort rounded capfules, 

 and their fix cells. Cattle are faid to eat this plant with 

 a\'idity. 



6. T. triandrum. Triandrous American Arrow-grafs. 

 Michaux Boreal.-Amer. v. 1. 208. Purfli n. 3. — " Sta- 

 mens three. Capfules roundifii, triangular. Leaves almoft 

 fetaceous, nearly as tall as the ftalk and its fpine." — Native 

 of overflowed marihes, near Charleilown, Carolina. Mi- 

 chaux. 



7. T. dubium. Doubtful Arrow-grafs. Brown n.2. — 

 " Capfules of three, oblong-cyUndrical, diftinft cells ; one 

 or two of them here and there abortive. Spike elongated." 

 — Gathered in the tropical part of New Holland by 

 Mr. Brown. 



^. T. decipiens. Deceitful Arrow-grafs. Brown n. 3. — 

 " Capfules roundiih, of three cells, with three dorfal keels ; 

 pointlefs at the fummit : three alternate ones abortive, with- 

 out ftigmas. Leaves femicylindrical. Stipula intrafoliace- 

 ous, undivided." — Found in New South Wales, Van Die- 

 men's ifland, and the fouth part of New Holland by Mr. 

 Brown. The abortive cells look like partitions. 



9. T. mucronatum. Poiuted-fruited Arrow-grafs. Bi-own 



n. 4 " Capfules fomewhat turbinate ; the points of their 



three perfeft cells divaricated ; three abortive ones like par- 

 titions. Leaves neai4ycyhndrical. Spike of few flowers." 

 — Gathered by Mr. Brown, vnXhovit Jlotveri, on the fouth- 

 ciii coail of New Holland. 



TRIGLOCHINE, in Anatomy, a fynonym of the tri- 

 cufpidal valve. See Tricuspid. 



TRIGLYPHS, formed from Tpi-) Xu^io?, q. d. three en- 

 gravings, from 7?iD_'i,, fculpo, in ArchiteSure, a fort of or- 

 naments repeated at equal intervals in the Doric fireeze. 

 Each triglyph confifts of two entire gutters, or channels, * 

 cut to a right angle, called glyphes, and feparated by 

 three interltices, called by Vitruvius femora, from each 

 other, as well as from two other half-channels which are at 

 die fides. I 



The ordinary proportion of triglyphs, is to be a module | 

 broad, and one and a half high. But this proportion, 

 M. le Clerc obferves, fometimes occafions ill-proportioned 

 intercolumnations in the porticoes ; for which reafon he 

 choofes to accommodate the proportion of his triglyphs to 

 that of the intercolumnation. 



The intervals between the triglyphs are called metopes. 

 — Under the channels, or glyphes, are placed guttae, or | 

 drops. " 



The triglyphs make the moll diftinguifhing character of 

 the Doric order. Some imagine them originally intended 

 for the conveyance of the guttse that are underneath them ; 

 others fancy they bear fome refemblance to a Ivre, and 

 thence conjefture the ornament to have been originally in- 

 vented for fome temple facred to Apollo. See Doric. 



Triglyph, Capital of a. See C.'Vpital. 



TRIGLYPTON, in Ancient Geography, a town of Italy, 

 on the other fide of the Ganges, in the countrj' called Randu- 

 marcotta. 



TRIGNO, in Geography, a river of Naples, which nins 

 into the Adriatic, 1 2 miles N. W. of Termoh. 



TRIGOLO, a town of Italy, in the department of the 

 Upper Po ; 5 miles S.E. of Crema. 



TRIGON, Trigoxus, formed from Tpiyaivo-rs triangle, in 

 Geometry, a triangle. 



TuiGON, in AJlrology. See Triplicity. 



Trigon, in Aflronomy, denotes an afpeft of two planets, 

 wherein they are 120 degrees diftaiit from each other: tliis 



is called alfo trine. 



The 



