164 CRASSULACEAE. [Vor. II. 
Carpels distinct to the base; plants very succulent. 
Stamens of the same number as the sepals; minute herbs. 1. Villaea. 
Stamens twice as many as the sepals; succulent herbs, 
Flowers saree 5 2. Sedum. ; 
Flowers 6-12-parted. 3. Sempervivum. 
Carpels united to about the middle; plant scarcely succulent. 4. Penthorum., 
1. TILLAEA L, Spee es. 1759 
Minute, mostly glabrous, aquatic or mud-loving succulent herbs, with opposite entire 
leaves and very small solitary or cymose-paniculate axillary or terminal flowers. Calyx 
3-5-parted. Petals 3-5, distinct, or united at the base. Stamens 3-5. Carpels 3-5, distinct. 
Styles short, subulate. Ovules usually few. Follicles few-seeded or several-seeded. 
{Named after Michael Angelo Tilli, 1653-1740, an Italian botanist. ] 
About 20 species, of very wide geographic distribution. Besides the following, about 4 others 
occur in the western and southwestern States. 
1. Tillaea aquatica L. Pigmy-weed. (Fig. 1809.) 
Tillaea aquatica I,. Sp. Pl. 128. 1753. 
Tillaea simplex Nutt. Journ. Acad. Phil. 1: 114. 1817. 
Bulliarda aquatica DC. Prodr. 3: 382. 1828. 
Stem ascending or erect, usually simple, 14/-3’ high, 
glabrous. Leaves linear-oblong, entire, acutish or obtuse 
at the apex, connate at the base, 2’/-3’’ long, at length 
shorter than the internodes; flowers solitary, axillary, ses- 
sile or short-peduncled, 14’ broad; calyx-lobes, petals, 
stamens and carpels 4, rarely 3; petals greenish, about 
twice the length of the calyx-lobes; follicles ovoid, longer 
than the calyx-lobes, S-10-seeded. 
Muddy banks of streams, Nova Scotia to Massachusetts and 
Maryland, near the coast. Stem often rooting at the nodes. 
Also in Europe. July—Sept. 
2. SEDUM EOP.) bled Zon 753. 
Fleshy mostly glabrous herbs, erect or decumbent, mainly with alternate, often imbricated, 
entire or dentate leaves, and perfect or dioecious flowers in terminal often 1-sided cymes. 
Calyx 4-5-lobed. Petals 4-5, distinct. Stamens 8-10, perigynous, the alternate ones usually 
attached to the petals. Filaments filiform or subulate. Scales of the receptacle entire or 
emarginate. Carpels 4-5, distinct, or united at the base; styles usually short; ovules «. 
Follicles many-seeded or few-seeded. [Latin, to sit, from the lowly habit of these plants. ] 
About 150 species, mostly natives of temperate and cold regions of the northern hemisphere, a 
few in the mountains of Mexico and the Andes of South America. Besides the following, about 
20 others occur in the western parts of North America. 
Cyme regular, compound, the flowers not secund; leaves broad, flat. 
Flowers dioecious, mostly 4-parted. 1. S. roseum, 
Flowers perfect, 5-parted. 
Petals purple; plant somewhat glaucous; petals twice as long as the sepals. 
2 
2. S. Telephium. 
Petals pink; plant very glaucous; petals 3-4 times as longas the sepals. 3. S. /elephtoides. 
Flowers secund along the branches of the cyme. 
Petals yellow. 
Leaves short, thick, ovate, densely imbricated. 4. S. acre. 
Leaves linear or terete, scattered on the stems. 
Annual; petals little longer than the sepals. 5. S. Torreyt. 
Perennial; petals twice as long as the sepals. 
Plant 3'-6' high; native, western. 6. S. slenopetalum. 
Plant 8'-12' high; introduced in a few places. 7. S. reflexum, 
Petals purple or white. 
Leaves terete; petals purple, pink, or white. 8. S. pulchellum. 
Leaves flat, spatulate or obovate; petals white. 
Lower leaves verticillate in 3's. g. S. fernatum. 
Leaves all alternate. 10. S. Nevtt. 
