CLXVIL | HYDROCHARIDEJF. 449 
obvie; Marine maris Tudiei incole exceptis TAalassia testudinwm, Koen. ex India occidentali et 
speciebus Americanis 2 valde dubiis Halophile. 
Ordo distinetissimus, a nonnullis Naiadeis adjunctus ob habitum fluitantem v. natantem et 
semina exalbuminosa, longe tamen differt ovario infero sy pico, placentis parietalibus oc-ovulatis. 
Habitus idem observatur in aliis pluribus ordinibus, e.g. in Ponederiaceis, in Cyperaceis paucis, ut. 
etiam in dicotyledonibus nonnullis. Semina Glyeydrarwm iis Burmanniacearwm similiora quam 
Naiadearum ; embryo Marinarum ei Zosterearum paullo propius accedit, 
CONSPECTUS GENERUM. 
Series I. Glycydree. Herbs in aqu» dulei submerse v. natantes.  Plumula, ubi nota 
minima, intra embryonis substantiam omnino recondita. 
Tribus I. Hydrillece.. Caulis elongatus, submersus, undique foliatus, foliis parum elongatis, 
Spathe parvis, ad axillas sessiles. « Placentze in ovario parum prominentes. 
1l. HipmrLrA. Folia verticillata. Spatb» d subglol 1l-Horme. Perianthium duplex. 
Stamina 3. Styli 3, indivisi. Ovula anatropa.— 4sia trop., Australia. 
2. Eropza. Folia verticillata rarius opposita. Spathe d 1-3-flore. Perianthium duplex. 
Stamina 3, 6 v. 9. Styli 3, emarginati v. 2-fidi. Ovula orthotropa.—A4mer. bor. et austr., in 
Eur. inquilina, 1 
9. LacAmosreHON. Folia sparsa.  Spathe d multiflome. Perianthium duplex. Stamina 
perfecta 3, Styli 3, emarginati v. 2-fidi. Ovula orthotropa.— 4sia rop., Madag., Africa. 
"Tribus II. Valisnerlec. Caulis brevissimus, interdum stolones reptantes v. natantes 
emittens, Folia conferta, immersa, sessilia, elongata. Spathz peduneulatm. Placentm in ovario 
parum prominentes. 
4. VarLISNERIA, Spathée d ovoides, floribus numerosis fere in globum confertis; 9 cylin- 
draces l-flore. Perianthium simplex. Btamina 1-3. Fructus linearis, erostris.— Utriusque 
orbis reg. calid. et temp. 
5. Bryxa. Spath:e utriusque sexus eylindracem, d co-flore, 9 1-flore. Perianthium duplex. 
Stamina 3-9. Ovarium longe rostratum. Fruetus linearis.— Asia trop., ins. Mascar., Australia. 
6. Hvpnormornus. Flos $ in spatha cylind solitarius. Perianthium duplex (interius 
interdum 2-merum). Stamina 3. Ovarium longe rostratum.  Fruetus linearis. Semina 
echinata, rostrata.— Bengalía. 
Tribus III. Stratiotece. Caulis brevissimus, Folia conferta, alia sessilia submersa, alia 
(excepta Stratiote) longe petiolata, lamina natante. .Spathe pedunculatw.  Placente 2-lamellat 
valde intruss, ovarium in loeulos 6 subperfecte dividentes. 
7. Lnwwosruw. . Spathz 2-phylle, d'2-8-Home, 9 1-fore. Perianthium duplex. Stamina 
3-9. Styli 3. Fructus ovoideus v. oblongus.— Aer. bor. et trop. 
8. Hypnocnuanis. Spathe d 2-phylle pauciflore, 9 l-phylle imn l-üorm, Perian- 
thium duplex. Staminum filamenta 6, 2-fida, quorum 3 2. herife Styli 
6, 2-idi. Fruetus ovoideus v. oblongus.—Eur. As. aed., in Australia p ins. Mascar. inquilina, 
9. OrrELIA. Flos jin spatha tubulosa solitarius. Perianthium duplex. Stamina 6—o0. 
Ovarium rostratum. Styli 6, 2-fidi. Fructus oblongus, sepe 3-6-alatus.— Orb, vet. reg. trop. 
' et subirop., Brasilia, 
10. Boorru.  Spathe tubuodE, d cds. 9 1-florm. Perianthium duplex. Stamina 
6-10. Ovarium crasse rostratum. Styli 6-16, 2i. Fructus ao-costatus, exalatus.— Burma, 
Afr. trop. 
11. "ria fi — Spathe 2-phylle, d 2-oo-flore, 9-1-flore. Perianthium duplex. — Sta- 
minall-ló. Ovarium rostratum. Styli 6, 2-fidi. Fructus pedicello recurvo e codes ie 
Folia submersa spinuloso-serrulata, nec natantia.—Zuropa. 
Series II. TMarinee, seu Tribus IV.  Thalassiece.  Herbm marine submersm. Coty- 
ledon ubi nota extra radiculam erassam prominens. 
12. Exmarus. Spathw 2-phylle, d subsessil ltifl 9 longe peduneul 1-flore. 
Perianthium duplex. Stamina 3. Ovarium longe rostratum. Styli 6-12, filiformes, Folis 
^ gubmersi longissima, basi per 2-3 vagina tenui stipata.—AMare Indicum. 
662 
