(2) 
4. Tillaeastrum Pringlei Rose,* sp. nov. 
meat little plants growing in masses in damp mountain soil, 
2-3 cm. high; leaves linear, 3-4 mm. long, acute; flowers axillary, 
solitary on very short peduncles, mm. or less long, in fruit be- 
coming 3 mm. long; carpels eee seeds oblong, not papillose. 
Collected by C. G. Pringle, September, 1896, Serrania de Ajusco, 
Federal District, Mexico (no. 6517). 
5. TILLAEASTRUM VAILLANTI (Willd.) Britton. 
Tillaea Vaillantd?d Willd. Sp. Pl. 1: 720. 1798. 
Bulliarda Vatllantii DC. Pl. Grasses, A/. 74. 1799. 
Crassula Vaillanti?d Schoenl. in E. & P. Nat. Pal. 3%: 37. 1891. 
Prince Edward Island. Europe and northern Africa. 
OLIVERELLA Rose, gen. nov. 
Caulescent and much branched perennial; leaves flat but fleshy. 
Flowers usually solitary (sometimes in pairs), terminating leafy 
branches. Calyx-lobes unequal, linear, spreading. Corolla very large 
ickish. Stamens 
1o. Carpels 5, free, rather short, terminated by long slender styles. 
Named for Mr. George W. Oliver, for many years connected 
with the National Botanic Garden at Washington but now employed 
as an expert in the Department of Agriculture. It was due to Mr. 
Oliver that we were able to flower this beautiful plant, as well as 
many more of the species described below, and it gives me great 
pleasure to name for him this, the most remarkable of all the 
Crassulaceae of America. 
Oliverella elegans Rose, sp. nov. 
Porag esse 3-5 dm. high, branching throughout, densely pubes- 
; leaves closely set near the ends of young branches, gradually 
falling away below, oblanceolate to spatulate, thick, but flattened 
except at base, acute, pubescent, 2-3 cm. long; flowering branch 
Found 4 in cultivation at Amacamaca, near were of Mexico, by J. 
N. Rose, August, 1901 (no. 6073), and flowered in succulent house, 
Department of Agriculture, in June, 1902 and July, 1903. 
* These descriptions of new species by Dr. Rose are published with the 
permission of the Secretary of the Smithsonian Institution. All his types 
unless otherwise stated are in the National Herbarium. 
