ROSE — MEXICAN AND CENTRAL AMERICAN PLANTS. 301 



sepals 5, linear, acute, terete, 3 mm. long; petals yellow, 6 mm. long, lanceolate, acute, 

 widely spreading or sometimes turned backward; stamens 10, erect, yellow; carpels 

 5, long-attenuate, yellow, at first erect; scales yellow, broad. 



TypeU. S. National Herbarium no. 618379, collected by J. N. Rose near Tehuacan, 

 Mexico, in 1905, and flowered first in Washington in 1910. 



Named for Dr. Wm. Trelease, who first collected material (in 1904), but whose 

 specimens have not yet flowered with me. 



NEW SPECIES OF FOUR GENERA. 



Tilleastrum latifolium Rose, sp. nov. 



Delicate annual, 2 to 3 cm. high; leaves opposite, somewhat connate at base, 1 or 2 

 pairs below the flowers, the upper ones congested, lanceolate, acute or even apiculate, 

 the margin serrulate; flowers axillary and solitary but often appearing as if in an 

 umbel of 10 or more; pedicels filiform, 10 to 15 mm. long; sepals 3 or 4, filiform, 2.5 

 mm. long; petals broadly oval to orbicular, 1 mm. long, shorter than the carpels; 

 stamens 3 or 4; carpels 3 or 4, purplish, each 10 or more seeded. 



Type II. S. National Herbarium no. 451508, collected by J. N. Rose and J. H. 

 Painter on the side of the Nevada de Toluca, Mexico, October 15, 1903 (no. 7891). 



This species is not closely related to any of the Mexican species of the genus. 



Tilleastrum longipes Rose, sp. nov. 



Stems simple, erect, about 2 cm. high; leaves linear, acute, 1 mm. or less broad; 

 peduncles slender, filiform, weak, 2 to 4 mm. long, sometimes much longer than the 

 leaves; sepals green, about half as long as the petals; seeds several, oblong in outline, 

 smooth. 



Type II. S. National Herbarium no. 401957, collected by 0. G. Pringle on river 

 ledges at Trinidad, Hidalgo, May 10, 1904 (no. 13407). 



Very different from both T. viride and T. pringlei in its long peduncles. 



Pachyphytum compactum Rose, sp. nov. Plate 61. 



Caulescent, 10 cm. or more high; leaves closely set at right angles to the stem, very 

 fleshy but somewhat flattened, more or less purplish, somewhat glaucous, pointed, 

 2 to 2.5 cm. long; flowering stem 40 cm. long, more or less highly colored ; stem leaves 

 small (10 cm. long); flowers 7 to 10, racemose; lower pedicels 10 to 15 mm. long, the 

 upper shorter; sepals appressed to the corolla, nearly equal, reddish below but with 

 greenish tips, acute; corolla 8 mm. long; petals broad, reddish except the green tips, 

 acute; stamens opposite the petals appendaged. 



TypeU. S. National Herbarium no. 574499, collected by C. A. Purpusat Ixmiquilpan, 

 Hidalgo, Mexico, March, 1910. 



It did not flower in cultivation until March, 1910. 



Resembling P. brevifolium but with longer leaves and acute instead of obtuse sepals 

 and petals. 



TTrbinia lurida Rose, sp. nov. 



Leaves clustered in a dense rosette, very thick, ovate, acuminate, glabrous, purple 

 or lurid in color, 3 to 4 cm. long, 1.5 to 2.5 cm. broad at widest point; flowering stem 

 25 cm. long, two-branched in only specimen seen; stem leaves small, bract-like, 

 scattered; sepals small, ovate, acute; corolla 6 to 7 mm. long; petals acute, erect 

 except the small outturned tip; carpels distinct to the base. 



Type U. S. National Herbarium no. 571269, collected by Dr. E. Palmer in a " box 

 canon" near Tobar, Durango, Mexico, May 28, 1906 (no. 248). Only four specimens 

 were obtained, of which two reached Washington in good condition, one of them 

 flowering April 22, 1908. From this the accompanying illustration was made. This 

 plant died soon afterwards, while the only remaining plant has not done well and 



