56 NORTH AMERICAN FLORA [Voi^UME 22 



1. Diamorpha cymosa (Nutt.) Britton ; Small, Fl. SE. U. S. 498. 1903. 



Tillaea? cymosa Nutt. Gen. 1 : 110. 1818. 



Diamorpha pusilla Nutt. Gen. 1 : 293. 1818. l^ot Sedum pusillum^ Michx. 



Glabrous, reddish, 2-10 cm. high, branching near or at the base, the branches very 

 slender. Leaves 2-5 mm. long, 2-3 mm. wide, oblong, obtuse, sessile; cymes few-several- 

 flowered, the pedicles slender, 1-2.5 mm. long; calyx-segments triangular, acute or acut- 

 ish, slightly spreading ; petals oblong, boat-shaped, 3 mm. long, obtuse, about three times 

 as long as wide ; stamens shorter than the petals ; carpels lanceolate ; follicles lanceolate, 

 2-2.5 mm. long, widely spreading above the united lower part, their tips curved. 



Type locality : Flatrock, near Camden, South Carolina. 



Distribution : On rocks, North Carolina and Tennessee to Georgia and Alabama. 



Illustration : DC. Mem. Crass, pi. l^f. 9. 



2. Diamorpha Smallii Britton, sp. nov. 



Very delicate and almost filiform, glabrous, 5 cm. high or less. Leaves oblong, obtuse, 

 1,5-2 mm. long; cymes few-flowered, the pedicels filiform, about 2 mm. long; caXyK.- 

 segments triangular, acute; petals broadly ovate-oblong, obtuse, 2-2.5 mm. long, about 

 twice as long as wide ; carpels ovoid. 



Falls of the Yadkin River, Stanley County, North Carolina, J. K. Small, April 20-24, 1896. 



21. CREMNOPHILA Rose, gen. nov. 



Perennial with a thick woody caudex and Pachyphytum-Xik.^ leaves forming dense 

 rosettes; leaves large, very-thick, glabrous. Inflorescence a narrow compact panicle, the 

 lower branches scarcely longer than the others. Calyx deeply 5-lobed, the lobes erect, 

 narrow, thickish. Corolla bright-yellow ; petals distinct. Stamens 10, free to the base. 

 Scales retuse. Carpels erect. 



Type species, Sedum nutans Rose. 



1. Cremnophila nutans Rose, 



Sedum nutans Rose, Bull. N. Y. Eot. Card. 3 : 43. 1903. 



Caudex 5-7 cm. long, 10-12 mm. in diameter. Leaves 6-8 cm. long, 3^ cm. broad, 1 

 cm. or more thick, green, not glaucous ; flowering stem 1-2 dm, long, bearing many orbic- 

 ular to ovate obtuse leaves 1-2 cm. long ; panicle about 1 dm. long, many-flowered ; calyx- 

 lobes 4-6 mm. long ; petals bright-yellow, 6 mm. long, acute. 



This is a most interesting plant and quite unlike any other known Mexican species of the Cras- 

 sulaceae. The plants grow on damp mossy nearly perpendicular cliffs and in almost inaccessible 

 places. The flowering stem usually hangs down and the secondary branches stand up, but in her- 

 barium specimens the reverse is suggested ; in cultivated specimens the flowering stems are nearly 

 erect. 



Type locality : Mossy cliffs of Tepoxtlan, Morelos, Mexico, altitude 2250 meters. 



DiSTRiBtTTlON : Known only from the type locality. 



22. RHODIOLA I.. Sp. PI. 1035. 1753. 



Perennials with a woody and somewhat branching rootstock. Leaves broad and com- 

 paratively thin. Mowers dioecious or polygamous, 4- or 5-parted, Corolla purplish, yel- 

 lowish or greenish. Carpels erect. Style very short or none. 



Type species, Rhodiola rosea L- 



Petals yellow or greenish-yellow, obtuse. 



Petals flat ; leaves ovate to oblanceolate. 1, R, rosea. 



Petals concave, hooded at the apex; leaves, except the lower, linear to ' ' 



narrowly oblanceolate. 2. R. 7ieo-mexicana. 



Petals purple or purplish, acuminate to obtuse. 

 Follicles 3-8 mm. long ; western species. 



Petals obtuse ; Alaskan species. 3. R, alaskana. 



Petals acute to acuminate ; western species. 



Petals acute ; follicles 3-5 mm. long, the beak 0.5 mm. long, diver- 

 gent or recurved. 4. R. integrifolia. 

 Petals abruptly acuminate ; follicles 6-8 mm. long, the beak 1 mm. 

 _ long, ascending or spreading. 5. R. polygama. 

 Follicles 8-12 mm. long ; southeastern species. 6. R. roanensis. 



