492 DIONAEACEAE 



1. DROSERA L. 



Perennial sometimes scapose herbs, with elongated or corm-like rootstocks, the pubes- 

 cence glandular. Leaves alternate, usually basal : blades varying from filiform to peltate, 

 circinate in vernation : stipules a scarious dilation at the base of the petiole or wanting. 

 Sepals 4-8, withering. Petals 4-8, white or pink, broadened upward. Stamens 4-8 : 

 filaments subulate or filiform : anthers extrorse. Ovary 1-celled, superior, sessile : styles 

 2-5, distinct. Capsule 2-5-valved. Seeds minute, the testa loose, reticulated. SUNDEW. 



Leaf-blades suborbicular or broader than long. 1. D. rotund ijolia. 



Leaf-blades filiform, linear, spatulate or cuneate. 

 Corolla white or pink : leaves with dilated blades. 



Leaf-blades cuneate, usually longer than the petioles : scapes glandular-pubescent. 



2. D. brmifotta. 

 Leaf-blades spatulate, usually shorter than the petioles : scapes glabrous. 



Leaf-blades broadly spatulate : corolla pink. 3. D. capiUnri*. 



Leaf-blades linear-spatulate : corolla wnite. 4. D. interim ii in. 



Corolla purple (rarely white): leaves with filiform blades. 5. D. filiform /*. 



1. Drosera rotundifolia L. Annual, or perennial by short rootstocks. Leaves basal, 

 2-4 cm. long ; blades suborbicular, much shorter than the flat glandular-pilose petioles : 

 scapes erect, solitary or tufted, glabrous, 5-30 cm. tall, wiry, few-many-flowered : sepals ob- 

 long, ^4-5 mm. long, obtuse : corolla white, 5-6 mm. broad : petals white, expanding in 

 sunshine, somewhat longer than the sepals : capsule about 5 mm. long : seeds slender-fusi- 

 form, 1.5 mm. long, with a loose wrinkled testa, acute at both ends. 



In bogs or wet sandy swamps, Labrador to Alaska, Florida, Alabama and California. Also in 

 Europe and Asia. Summer. 



2. Drosera brevifolia Pursh. Biennial, or perennial by short rootstocks, glandular- 

 pilose. Leaves basal, flimsy, 1-1.5 cm. long ; blades cuneate, mostly longer than the pet- 

 ioles: scapes erect, solitary or several together, 5-15 cm. tall, 2-6-flowered, glandular- 

 pilose : sepals oblong, 3-10 mm. long, acute, united below : coralla white, 1.5 cm. broad : 

 capsule about as long as the calyx : seeds oblong, 0.3 mm. long, minutely tuberculate all 

 over. 



In damp sandy pine lands, North Carolina to Florida. Spring. 



3. Drosera capillaiis Poir. Biennial, or perennial by short rootstocks. Leaves 

 basal, 3-6 cm. long ; blades spatulate, much shorter than the 'slender, elongated, glabrous 

 petioles: scapes erect, 5-40 cm. tall, wiry, solitary or several together, glabrous, 5-20- 

 flowered : sepals oblong, 3-4 mm. long, obtuse : corolla pink, 8-9 mm. broad : capsule sur- 

 passing the calyx : seeds oval, 0.5 mm. long, minutely tuberculate all over. 



In and about ponds, South Carolina to Florida. Spring. 



4. Drosera intermedia Hayne. Perennial by elongated rootstocks. Leaves slender, 

 2-6 cm. long ; blades spatulate, much shorter than the slender glabrous petioles : scapes 

 usually decumbent, wiry, 5-20 cm. tall, 6-14-flowered, glabrous: sepals oblong, about 4 

 mm. long, obtuse, united at the base : corolla white, 10-12 mm. broad : capsule obovoid, 

 4-4.5 mm. long : seeds oblong, with a close roughened testa. 



In sandy swamps or ponds, Anticosti to Manitoba, south to Florida and Louisiana. Also in the 

 West Indies and Europe. Summer. 



5. Drosera filifdrmis Kaf. Perennial by short rootstocks. Leaves basal, filiform, 

 without distinction between blade and petiole, 1-4 dm. long, conspicuously glandular- 

 villous throughout, erect : scapes erect, solitary or several together, 1-6 dm. tall, gla- 

 brous, few-many-flowered : sepals 5, oblong to oval, about 4 mm. long, united below, 

 glandular-pubescent like the pedicels, which are longer or shorter than the calyx : corolla 

 bright purple or rarely white, 2.5-3 cm. broad : petals 5, cuneate-obovate, erose at the 

 apex : capsules oblong-ovoid, about 5 mm. high : seeds 0.6 mm. long, oblong, papillose. 



In wet pine lands or sandy swamps, Massachusetts to Florida, chiefly near the coast. Spring and 

 summer. 



FAMILY 2. DIONAEACEAE Lindl. VENUS' FLYTRAP FAMILY. 



Perennial glabrous herbs, with corymbosely branched scapes. Leaves basal, 

 with dilated petioles and short 2-lobed blades with coarsely ciliate margins and 

 irritable, the two lobes folding together when stimulated. Sepals 5, spreading. 

 Petals 5, hypogynous, white, the broad tip eroded. Androecium of 10-20, often 

 15, stamens, inserted with the petals : filaments filiform, united at the base : 

 anthers extrorse. Gynoecium of 5 united carpels. Ovary sessile, 1-celled, 

 nearly superior : styles united : stigmas 5, pinnatifid. Ovules on a basal pla- 

 centa. Capsule sessile, opening irregularly. Seeds numerous, with a smooth 

 shining testa. 



