330 CRASSULACEAE 



1. Drosera rotundifolia L. Round-leaved Sundew. Fig. 2172. 



Drosera rotundifolia L. Sp. PI. 281. 1753. 



Leaves spreading on the ground, the blades orbicular or nearly so, 6-12 mm. broad, abruptly 

 narrowed to a flat petiole, 2-5 cm. long, the upper surface clothed with slender glandular hairs; 

 scape glabrous or once-forked, 1-25-flowered ; pedicels 2-4 mm. long ; flowers opening in sun- 

 shine, 4 mm. broad ; petals white or reddish, oblong ; seeds spindle-shaped, the testa loose. 



Bogs, chiefly Boreal Zones; Alaska to Labrador, south to Florida and central California; also Europe and 

 Asia. Type locality: in Europe. July- Aug. 



2. Drosera longifolia L. Oblong-leaved Sundew. Fig. 2173. 



Drosera longifolia L. Sp. PI. 282. 1753. 



Drosera anglica Huds. Fl. Angl. ed. 2. 135. 1778. 



Leaves erect, blades elongate-spatulate, 3-4 mm. wide and 15-30 mm. long, narrowed to spar- 

 ingly hairy petioles 25-75 mm. long ; scapes glabrous ; racemes several-flowered, rarely one- 

 flowered ; petals white ; seeds oblong, obtuse at both ends, the testa loose. 



Bogs, Boreal Zones; Arctic America to northern California, Idaho, Michigan, Ontario, and Newfoundland; 

 also Europe and Asia. Type locality: in Europe. July- Aug. 



Family 57. CRASSULACEAE. 

 Stonecrop Family. 



Mostly fleshy or succulent herbs or somewhat shrubby plants, without stipules. 

 Flowers usually cymose, rarely racemose or solitary, regular, symmetrical and 

 usually perfect. Calyx free from the ovary, 4— 5-parted or 4— 5-lobed. Petals the 

 same number as the calyx-segments, distinct or united below, usually persistent, 

 sometimes wanting. Stamens the same number as the petals or twice as many. 

 Carpels same number as calyx-segments, distinct or united below, usually with a 

 scale at the base of each ; styles subulate or filiform ; ovules many, arranged in 2 

 rows on the ventral suture, rarely few or solitary. Fruit composed of 1-celled fol- 

 licles, dehiscent along the ventral suture. Seeds minute ; endosperm fleshy, embryo 

 terete, with short cotyledons. 



A family of about 20 genera, and 500 species of wide geographical distribution. 



Stamens 3-5, as many as petals. 



Flowers clustered; seeds 1 or 2 in each carpel. 1. Tillaea. 



Flowers solitary; seeds several in each carpel. 2. Tillaeastrum. 



Stamens 10, twice as many as corolla-segments (5 in Sedella pentandra) . 



Carpels 1-seeded; seed erect; annuals. 3. Sedella. 



Carpels many-seeded; perennials. 



Petals united below. 



Flowering stems lateral, arising from the axils of the lateral leaves of the basal rosette. 



Plants with a stout often branched rootstock. 



Corolla tubular, the corolla-lobes erect with only the tips slightly spreading. 



4. Dudleya. 



Corolla with the segments widely spreading. 5. Stylophyltum. 



Plants with small corms. 6. Hasseanthus. 



Flowering stems terminal, arising from the apex of the basal rosette. 7. Gormania. 



Petals distinct. 



Flowers polygamous; leaves scattered, not forming rosettes; carpels erect. 8. Rhodiola. 



Flowers perfect; leaves usually forming rosettes; carpels more or less spreading. 



9. Sedum. 



1. TILLAEA [Micheli] L. Sp. PL 128. 1753. 



Minute glabrous, slightly fleshy annuals, with minute opposite entire leaves, and 

 minute flowers clustered in the axils. Calyx 3-5-parted. Petals 3-5, distinct, or united 

 at the base. Carpels 3-5, distinct, with short subulate styles. Fruiting carpels 1-2-seeded. 

 [Name in honor of Michael Angelo Tilli, Italian botanist.] 



A genus of about 25 species, natives of western North America, South America, New Zealand, Africa, and 

 Europe. Type species, Tillaea mucosa L. 



1. Tillaea erecta Hook. & Arn. Tillaea, Sand Pigmy-weed. Fig. 2174. 



Tillaea erecta Hook. & Arn. Bot. Beechey 24. 1830. 



Tillaea minima Miers ex Hook. & Arn. Bot. Misc. 3: 338. 1833. 



Tillaea leptopetala Benth. PI. Hartw. 310. 1849. 



Crassula minima Reiche, Fl. Chile 2 : 369. 1898. 



Diminutive simple or usually tufted annual, 2-8 cm. high, often reddish tinged, the branches 

 erect or ascending. Leaves 1.5-3 mm. long, ovate to oblong, connate at base; pedicels very 



