CXLVIII. NAIADES. 1705 



. Flowers hermaphvoclite, ebraoteate. Perianth-segments 3 or 6. Stiimens 0, 



inserted on the base of segments. Carpels 3 to 0, 1-ovulate 1. TrTriLocnra. 



Tribe II. Aponogretoneae. — Flowers spicate, lu'i-maphrodite, brads often nhite. Per- 

 ianth none or the segments and bracts 1 to S, coloured. Stamens 6 or more Uyporjynons. Carpils 

 3-5, 3 inavj-ovulate, ovules basal or subbasal. 



Flowers sessile in a simple or once forked spike 2. AroNOGETON. 



TiiiBK III. Potameae. — Flowers spicate, hermaphrodite. Perianth none or segments i 

 herbaceous. Stamens 2 or 4 insertedon the base of the segments. Carpels 4, 1-ovulate, owile 

 pmdulous below the apex or inserted on the ventral suture of the cell, campylotropous. 



Flowers 4-nierous. Carpels free 3. Potamoueton. 



Fruiting carpels on long stalks, at first sessile 4. Buppia. ; • 



Tkibk IV. Zostereae. — Flowers unisexual, on a complanaie sectmd spadix. Perianth none, 

 jilale flowers tiiith sesHle 1-celled anthers, pollen confervoid. Female flowers ; carpel solitanj, 

 sessile with 1 petidulous ovule, 



-Flowers monoecious. Carpel ovoid .5. Zosteea. 



XniBE V. Naiadeae. — Flowers unisexual, axillary. Perianth hyaline. Male flower with 1 

 sessile or 2 connate anthers, pollen globose. Female flowers ; carpel solitary, l-ovnlate, ovule 

 hasal, anatropous. 



Carpels l-seeded 6. Naias. 



TniBE VI. Cymodoceae. — Flowers unisexual, axillary. Perianth none. Male flowers.- i>f 

 2 sessile anthers more or less connate by their backs, with 2 parallel cells opening outwards in 

 longitudinal slits, pollen confervoid. Female floxoers; carpels 2, lovulate, ovule pendulous, 

 ■orthotrnpons. 



Anthers 2. Carpels 2 7. Cymodocea. 



1. TRIGLOCHIN, Linn. 



(Cycnogeton, Endl. Maundia, F. v. M.) 

 Flowers hermaphrodite or rarely polygamous. Perianth-segments scale-like, 3, 

 ■6 or fewer. Stamens as many or fewer, inserted at the base of the segments and 

 falling off with theni ; anthers sessile, broad, the cells opening outwards in longi- 

 tudinal slits. Carpels normally G, but 3 alternate ones sometimes reduced to 

 empty laminae, all more or less united in the axis at the time of flowering or 

 distinct from the first, the short terminal styles or stigmas always distinct. 

 Ovules solitary in each 'carpel, laterally attached below the middle. Fruit of 6 or 

 8 indehiscent decidaous l-seeded nutlets, the 3 empty carpels of some species 

 remaining attached to a central axis and assuming the appearance of dissepiments 

 ■of a capsule. Seed erect, cylindrical or ovoid, the testa membranous ; embryo 

 straight, the shape of the seeVl. — Marsh or aquatic herbs. Leaves all in radical 

 tufts', linear or filiform. Scapes erect, simple and leafless, bearing a terminal 

 spike of small flowers sessile or shortly pedicellate, without bracts. 



The genus is spread over a great part ot the globe, but mostly in extratropical Or subtropical 

 regions. 



Sect. I. Eutrigrlocllill. — Fruits with 3 perfect deciduous nutlets, leaving a central axil 

 with 3 thin barren carpels resembling dissepiments. Stamens usually S perfect or in the terminas 

 ilomer 0. 



Stock stoloniferoLis. Scape usually 3in. to »eiVly 1ft. high. Fruit nearly 

 orbicular I. T. striata. 



Dwarf plants without stolenes. Scaiie usually under Sin. high. Fruit 

 narrow, the perfect carpels wilh an angle or short spur at the base . . . 2. T.centrocarpa, 



Sect. II. Cycnoseton. -Fruits with 3 «o 6 perfect nutlets, uitliout any barren ones or 

 persistent axis. Stamens usually 6, rarely 4 or 5. 



Scapes 1 to 3ft. high. Leaves long. Carpels 6, rarely 3, more or less 

 united, at least when in flower or rarely free from the' first 3. T. procera. 



Sect. III. ItXaundia. — Fruits with 3 to i nutlets, cohering after flowering. 

 .Scapes tall, with a sheath at the base. Leaves linear, spongy. Nutlets 



almost drupaceous . .■ •. • •' .- . i. T. Maundii. 



