138 HALORAGE.E. 



8. JUSSUEA, Linn. Habit of the preceding. Leaves attenuate. 

 Flowers 5-merous; petals yellow. Calyx-tube not angular, elongated, 

 not produced beyond the ovary ; lobes conspicuous, persistent. Capsule 

 in ours indehiscent. Seeds very numerous. 



1. J. diffusa, Forsk. Perennial, the stout floating stems 1 ft. to 2 

 yards long: herbage altogether glabrous: leaves obovate to obovate- 

 oblong and even lanceolate, obtuse or acute, 12^ in. long, on petioles 

 of % 1 in.; stipules gland-like or slightly scale-like: fl. 6 8 lines broad, 

 deep yellow; the petals obtuse: fr. 1 in. long, spongy; the pedicel % in. or 

 more. Plentiful, forming extensive floating masses, covering the surface 

 of sluggish waters of the lower Sacramento and San Joaquin. 



OBDEB XLIL HALORAGE>. 



Plants herbaceous and mostly aquatic, with small inconspicuous 

 usually apetalous flowers sessile in the axils of leaves or bracts. Calyx, 

 in fertile flowers, adnate to the ovary, its limb short or absolete. Fruit 

 indehiscent and nut-like, 1 4-celled, with a single seed suspended in 

 each cell. Cotyledons small and short. Albumen copious. 



1. LIMtfOPEUCE, Vaillant. Erect stoutish but low perennial aquat- 

 ics. Stem simple, short-jointed, with linear entire leaves in whorls of 

 8 or 12. Calyx-tube globular; the limb entire. Petals Stamen 1; 

 filament subulate. Ovary 1-celled; style becoming filiform and elongated, 

 stigmatic throughout. Fruit oblong-ovoid, nut-like, 1-seeded. 



1. L. vulgaris, Vaill. Stem %l ft. high; herbage glabrous: leaves 

 % 1 i n - l n g acute: calyx % li ne long: style and stamen rather 

 conspicuous: nutlet nearly 1 line long. In shallow ponds and pools, 

 and about springy places, but not often met with. 



2. MYKIOPHYLLTJM, Malthiolus (WATEB-MILFOIL). Aquatic per- 

 ennials. Leaves verticillate, the submersed ones pinnately divided into 

 capillary or filiform segments; the emersed ones pectinate, or toothed, 

 or entire. Flowers spicate or axillary, commonly unisexual; the stam- 

 inate with a very short calyx-tube, and 2 4-lobed limb or none. Petals 

 2 4. Stamens 4 8. Calyx of pistillate fl. with a more or less deeply 

 4-grooved tube and 4 minute lobes or none. Styles 4, short, often 

 plumose and recurved. Fruit quadrangular, when ripe splitting into 

 4 one-seeded carpels. 



1. M. spicatum, L. Stems often many feet long, growing in deep 

 waters, branching above: flowers in emersed short-peduncled verticillate 

 spikes 23 in. long; bracts reduced and inconspicuous; submersed leaves 

 in whorls of 4 or 5: petals 4, deciduous: stamens 8: carpels rounded on 

 the back, with a deep wide groove between them. Mountain Lake, San 

 Francisco. July. 



