CLXX. NAI ADAGES. (J. D. Hooker.) 563 



or submerged or floating, base sheathing ; stipules or within the sheath. 

 Flowers inconspicuous, usually green, 1-2-sexual. Perianth 0, or tubular, 

 or of 3-4 inferior valvate segments. Stamens hypogynous ; anthers 

 1-2-celled. Ovary of 1-4 1-ovuled carpels, style long or short, stigma 

 various ; ovule erect or pendulous. Fruit of 1 -seeded utricles achenes or 

 drupelets. Seed exalbuminous ; embryo straight or curved, radicular end 

 very large. Temperate and tropical ; genera 16, sp. about 120. 



* Stigmas discoid or decurrent on the ovary, 

 f Perianth of sepals or scales. Flowers bisexual. 



Marsh herbs. Sepals 6, herbaceous green 1. TRIOLOCHIN. 



Aquatics. Sepals 1-3, white, membranous 2. APONOGETON. 



Aquatics. Sepals 4, herbaceous, green 3. POTAMOGETON. 



ft Perianth 0. Flowers uni- or bi-sexual. 



Aquatics. Stamen 2. Carpels stipitate 4. RUPPIA. 



Aquatics. Stamen 1. Carpels sessile 5. ZANNICHELLIA. 



** Stigmas subulate or capillary. Flowers unisexual. 



Fresh or brackish aquatics. Perianth hyaliue 6. NAIAS. 



Marine. Perianth 7. CYMODOCEA. 



1. TRIGLOCHIN, Linn. 



Scapigerous marsh herbs. Leaves rush-like, flat or terete. Flowers 

 small, bisexual, spicate or racemose, 2-bracteate. Perianth-segments 3 or 6, 

 herbaceous, concave, deciduous. Stamens 6, inserted on the base of the 

 segments ; anthers didymous, slits extrorse. Carpels 6, 1-celled, 1-ovuled, 

 3 alternate often imperfect ; styles short, often connate, stigmas peni- 

 cillate; ovules basilar, erect, anatropous. Fruit of 3 or 6 free or 

 connate achenes or follicles with recurved tips. Seed erect; embryo 

 straight. Genus cosmopolitan; species about 12. 



1. T. palustre, Linn. Sp. PI. 338 ; leaves ^-terete throughout, fruit 

 clavate, carpels 3 slender attached to the axis by a point. JZunth Enum. 

 iii. 143 ; Reickb. Ic. Fl. Germ. vii. t. 51 ; Boiss. Fl. Orient, v. 13. Tri- 

 glochin, Griff. Notul. iii. 204 ; Ic. PI. Asiat. t. 271. 



TEMPERATE and ALPINE HIMALAYA, and WESTERN TIBET, alt. 8-15,000 

 ft. DISTRIB. N. temp, regions and S. America. 



Steifa 6-24 in., tuberous and stoloniferous. Leaves 2-12 in., flaccid. Scapt 

 slender ; raceme elongating after flowering, pedicels short. Perianth green, margins 

 purplish. Anthers purple. Fruit in. long, appressed to the rachis; carpels 

 dorsally terete. 



2. T. maritimum, Linn. Sp. PL 339 ; leaves slightly flattened at 

 the tip, fruit oblong of 6 separable carpels. JZunth Enum. iii. 145 ; 

 Reickb. Ic. Fl. Germ. vii. t. 52 ; Boiss. Fl. Orient, v. 13. 



TEMPERATE and ALPINE HIMALAYA, and WESTERN TIBET, from 12,000-16,000 

 ft. DISTRIB. N. temp, regions. 



Larger, stouter, and more tuberous at the base than T. palustre. Scape stout, 

 curved ; raceme longer, but not elongating so much in fruit ; flowers larger ; fruit 

 in., not appressed to the scape, carpels grooved on the back. 



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