388 DR- A. B. IlENDLE — STSTExMATlC 



II. Systematic Account. 



Genus NAJAS. 



Najas, Linn. Gen. PI. no. 701 (1737), ej. Hort. Cliff. 437 (1737), et Sp. PI. 1015 (1753) ; Allioni, Fl. 

 " Pedem. ii. 221 (1785) ; Jussien, Gen. PI. 19 (1789); Willd. in Mem. Acad. P.oy. Sci. Berl. 1798, 



85 ; Lam. Encycl. Method, t. 799 (1798 ?) : Pers. Syn. ii. 551 (1807) ; Sclikulir, Bot. Handb.iii. 251 



(1808) ; Cham, in Linnsea, iv. (1829) 498; Endlicher, Gen. PI. no, 1656 (1837) ; Kunth,Enum. iii. 



Ill (1841) ; A. Braun in Journ. Bot. ii. (1864) 274, et in Sitzungsb. Ges. Naturf. Fr. Berlin, 1868, 



17; Le Maout & Decaisne, Traite Gen. Bot. 649 (1868); Magnus, Beitriige Kenntn. Gatt. 



Najas (1870), et in Engl. & Prantl, Pflanzenfam. ii. 1. 214 (1889), et in Ber. Deutsch. Bot. Gesell. 



xii. (1894) 214; Benth. & Hook. f. Gen. PL iii. 1018 (1883) ; Morong in Mem. Torr. Bot. Club, 



iii. no. 2 (1893), 57; K. Sclmm. in Mart. Fl. Bras. iii. pt. 3, 717 (1894). 

 Caroliana, Eafin. Journ. Phys. Chem. &c. Ixxxix. (1819) 259. 

 Canlinia, ViiM. in Mem. Acad. Roy. Sci. Berl. 1798,87; Endlicher, Gen. PI. no. ]655 (1837) ; T.Nees, 



Gen. PI. Fl. Germ. iii. (1845) ; Le Maout & Decaisne, Traite Gen. 649 (1868). 

 Fluvialis, J. Bauhiu, Hist. PI. iii. 779 (1651) ; Vaillant in Mem. Acad. Roy. Sci. 1719, 14; Micheli, Nov. 



PL Gen. 11 (1729) ; Adans. Earn. Plant, ii. 472 (1763) ; Pers. Syn. ii. 530 (1807). 

 Fucus, Tonrn. Inst. Herb. i. 569 (1700) ; Mappus, Hist. PL Alsat. 113 (1742). 

 Hyas, Dumortier, Anal. Fam. PL 61 (1829). 

 Ittntra, C. C. Gmel. Fl. Bad. iii. 590 (1808). 



Herbse animse, aqua dulci vel subsalina stagnante vel fluitante submorsge, radicantes ; 

 caules tenues saepe elongati, interdum dichotome ramulosi, inermes vel rarius 

 aculeati ; folia per paria approximuta, in specie opposita vel ternatim verticillata, e 

 vagina subbrevi anguste linearia, sinuato-dentata vel serrulata (dentes cum aculeo 

 ssepissime unicellulari luteo-brunneo terminati, ssepe ad aculeum e marglne protrusum 

 reducti), uninervia, rarius in nervi dorso spinifera ; vagina truncata vel rotundata, 

 vel superne in auriculis plus minus producta, in margine superiore vel in 

 aurieulis plus minus spinifera, ssepe asymmetrica, prsecipue in folio cujusque paris 

 superiore ; sqviamulae intravaginales binse minutse lanceolatee vel sa^pius angustab 

 et lineares aut iiliformes ; monoecise, rarius dioecite ; flores unisexuales specie 

 axillares, e basi ramorum orti, horum folio primo oppositi ; masculm monander 

 ante anthesin saepissime subsessilis et in spatha (quae cum collo cylindrico ore 

 spinifero instructa est) inclusus, monochlamydeus, periantliium apice bilabiatum ad 

 antheram arete applicitum ; anthera terminals saepissime subsessilis, quadrilocularis, 

 rarius unilocularis ; femineus nudus, rarius cum spatha simplici velut in mari 

 indutus, ovarium ovale, uniloculare, cum stylo simplici coronatum, stylus cylindricus 

 in stigmata 2-3 linearia papillosa desinens, vel interdum processubus quoque 

 oppositis spiniferis cum stigmatibus alternantibus instructus, ovulum solitarium 

 basale erectum anatropum cum integumentis duobus circumdatum ; fructus parvus 

 a folii vagina sub medium inclusus, ellipsoideus vel oblongus, vel fusiformis, 

 pericarpium tenuc semini adhairens; semen brunneum vel flavescens, testa 

 ssepissime strata tria, rarius plura exliibens, stratum externum varie evolutum demum 

 ssepius degenerans, strata interna incrassata et indurata, prsecipue, qua tria extant, 



