Par? 1, 1909] ELODEACEAK 71 
5. Philotria linearis Rydb. Bull. Torrey Club 35: 464. 1908. 
Dioecious water-plant; stem slender, 3-5 dm. long; leaves in 3’s, linear, acute, about 
1 cm. long, scarcely 1 mm. wide, apparently entire-margined; spathe of the staminate 
flowers peduncled ; peduncle 3-4 mm. long; body ovate, about 3 mm. long; sepals broadly 
oval, 2.5 mm. long; petals oblong, shorter; stamens 9; anthers oblong, 2 mm. long. 
TYPE LOCALITY: Swamp bordering Cumberland River, vicinity of Nashville, Tenn. 
DISTRIBUTION: Known only from the type locality. 
6. Philotria Planchonii (Casp.) Rydb. Bull. Torrey 
Club 35: 462. 1908. 
Anacharis canadensis Planch. Ann. Mag. Nat. Hist. II. 1: 86, mainly. 1848. 
Elodea Planchonti Casp. Jahrb. Wiss. Bot. 1: 468. 1858. 
Dioecious water-plant; stem slender, 1-10 cm. long; leaves in 3’s or the lower oppo- 
site, sessile, oblong to linear, 7-15 mm. long, 1-2 mm. wide, acutish; spathe of the 
staminate flowers obovoid-clavate, nearly 1 cm. long, on a peduncle, 5-10 mm. long; 
staminate flowers short-pedicelled; sepals elliptic, 5mm. long; petals lacking; stamens 
9; anthers oblong, 3-4 mm. long, subsessile; spathe of the pistillate flowers linear or 
lance-linear, sessile, 2-cleft at the apex; tube of the hypanthium slender, 3-5 cm. long; 
sepals and petals linear, about 3 mm. long; stigmas 3, linear; stamens none. 
TYPE LOCALITY: Saskatchewan. 
DISTRIBUTION : Lakes and ponds, from Saskatchewan to Colorado and Nevada. 
