Haloragidaceae 273 



G. pumilum Wats. A lower, less branched species witli nearly 

 sessile capsules; seeds very oblique in the cells, smooth. 



Not known within our limits, but occurs in Bear Valley and similar 

 places in the San Bernardino Mountains. 



Family 65. HALORAGIDACEAE. Water-milfoil 



Family. 



Perennial or rarely annual herbs, mainly aquatic, 

 with alternate or vert ieillate leaves, the submerged ones 

 often pectinate-pinnatifid. Flowers perfect or monoe- 

 cious or dioecious, axillary in interrupted spikes, solitary 

 or clustered. Calyx-tube adnate to the ovary, its limb 

 entire or 2-4-lobed. Petals small, 2-4 or none. Sta- 

 mens 1-8. Ovary ovoid-oblong or short cylindric, 

 2-8-ribbed or winged, 1-4-celled ; styles 1-4 ; stigmas 

 papillose or plumose. Fruit a nutlet or drupe, com- 

 pressed, angular, ribbed or winged, indehiscent, of 2-4 

 L-seeded carpels. Endosperm fleshy ; cotyledons minute. 



Ovary 1-celled. 1. Hippuris. 



Ovary 4-celled. i. Myriophyllum. 



1. HIPPURIS L. 



Aquatic herbs with simple erect stems and verticillate 

 entire leaves. Flowers small, axillary, perfect or some- 

 times neutral or pistillate. Limb of the calyx minute, 

 entire. Petals none. Stamens 1, inserted on the margin 

 of the calyx. Style filiform, stigmatic its whole length, 

 lying in a groove of the anther. Fruit a small 1-celled, 

 l-seeded drupe. 



1. H. vulgaris L. Stem slender, glabrous, 2-5 dm. high ; leaves 

 linear or lanceolate, acute, sessile, 1-20 mm. long, in crowded 

 verticils of 6-12; stamens with a short thick filament and com- 

 paratively large 2-celled anthers, dehiscent by lateral slits; seeds 

 ovoid; stigma persistent. 



Not known within our limits, but occurring in the San Bernardino Moun- 

 tains. 



