Myriophyllum.'] HALORRHAGIDACEAE. 453 



Terrestrial plants with monoecious flowers, $ flowers pedicelled; 

 petals 4 in $ flowers ; stamens 8 ; fruit 1-celled, 1-seeded 



1. Serpicula. 



Aquatic plants ; petals : 



Flowers hermaphrodite or monoecious, axillary or in spikes; stamens 

 2-8 ; fruit 4-furrowed or separating into carpels ; seeds 2 or 4 



2. Myriophyllum. 



Flowers unisexual, usually monoecious, axillary ; stamen 1 ; fruit 

 indehiscent, 4-celled; seeds 4 3. Callitriche. 



1. Serpicula. Linn. 



Small decumbent branching herbs. Leaves opposite or alternate, 

 entire or toothed. Flowers monoecious, axillary, <$ pedicelled, 

 $ sessile. Calyx-tube adnate to the ovary; lobes 4. Petals: 

 in <$ flowers 4, cucullate; in $ flowers 0. Stamens 8, filaments 

 filiform, anthers linear-oblong. Ovary 1-celled; ovules 4, pendu- 

 lous ; styles 4, short, stigmas plumose ; in <$ flowers pistillodes 4. 

 Fruit a minute, indehiscent nut, 1-celled, 1-seeded, the enclosing 

 calyx-tube ribbed or smooth. 



Glabrous, little branching ; leaves spathulate, entire or 3-toothed at 

 apex ; pedicels short, scarcely '4 in. long ; petals acute at apex ; fruit 



glabrous, ribbed and warted 1. brevipes. 



Hirsute with crisped hairs, much branched; leaves obovate,3-5-toothed 

 at apex ; pedicels long, usually '6 to '8 in. long; petals obtuse at apex ; 

 fruit hairy, not ribbed 2. hirsuta. 



1. SERPICULA BREVIPES, W. & A. 338. S. indica, Thw. ; 

 F. B. I. ii. 431 in part. 



W. Ghats, in Nilgiris and Pulneys, at 6,000-7,000 ft., in 

 wet places. 



2. SERPICULA HIRSUTA,W.& A. 338 ; Wt.Ic.t, 1,001. S. indica, 

 Thw.; F. B. I. ii. 431 in part. 



W. Ghats, in the Nilgiri Hills at 6,000-8,000 ft., on banks, 

 common. 



2. Myriophyllum, Linn. 



Glabrous aquatic herbs with floating stems. Leaves opposite 

 or whorled, the floating ones usually linear- serrate, the submerged 

 ones pectmately pinnatifid. Flowers very small, hermaphrodite 

 or monoecious, axillary or in nearly naked spikes ; <$ very shortly 



