70 PROCEEDINGS OF THE AMERICAN ACADEMY. 



chestnut-colored : achene flattened, oblong-obovate, 3 to 4 mm. long, 

 bearing on either surface in the upper half near the margin a longitudinal 

 ridge, minutely pitted, dark brown in color ; tubercle or beak conical, 

 about as long as the achene: seta? unequal, 6 in number and mostly 

 shorter than the achene. — Mexico. State of Michoacan : in swamps 

 near Zamora, altitude 1500 m., 24 May, 1901, and 25 July, 1902, 

 C. G. Pringle, nos. 9668, 8642 (hb. Gr.). 



The affinity of Rhynchospora Prlnglei is with R. aurea, Vahl., and 

 R. aristata, Boeck., but it differs from both these species in the con- 

 tracted inflorescence, and in the achenial characters. 



Tradescantia dracaenoides. T. longifoUa, Greenm., Proc. Am. 

 Acad, xxxiii. 471 (1898), not Small, Bull. Torr. Bot. CI. xxiv. 233 

 (1897). Dlchorisandra longifoUa, Mart. & Gal. Bull. Acad. Brux. ix. 

 378 (reprint p. 7). T. Jiolosericea, var. draccenoides, Clarke in DC. 

 Monogr. Phanerog. 302; Hemsley, Biol. Cent.- Am. Bot. iii. 393. 



Tradescantia saxicola. Stems decumbent or ascending, simple or 

 branched, 1 to 2 dm. high, commonly rooting at the nodes, glabrous ex- 

 cept along a line continuous with the short ciliated sheath opposite the 

 leaf-blade, purplish : leaves narrowly lanceolate, 1.5 to 4 cm. long, 4 to 

 8 mm. broad, acute, slightly hirtellous-margined, sparingly pubescent 

 above, glabrous beneath : inflorescence terminating the stem and branches 

 in sessile subumbellate floral-clusters ; pedicels reflexed and, as well as 

 the calyx, hirsute-pubescent : sepals oblong-ovate, 4 to 4.5 mm. long, 

 obtuse : petals white, somewhat exceeding the calyx : stamens unequal ; the 

 outer cycle shorter, and with glabrous filaments ; the inner fully equal- 

 ling the petals, with bearded filaments, and with anther-cells separated 

 by rather broad connectives: capsule small, smooth and glabrous, 2 to 

 3 mm. in length. — Mexico. State of Guerrero: on ledges, Iguala 

 Canon, near Iguala, 14 September, 1900, C. G. Pringle, no. 9270 

 (hb. Gr.). 



This species belongs to the section Descantaria, and in general habit 

 resembles T. angusti folia, Robinson, T. disgrega, Kunth, and T. midti- 

 Jlora, Swartz. 



Tradescantia Urbinana. Roots tuberiform, fleshy : stems branch- 

 ing from the base; branches erect, 2 to 5 dm. high, glabrous: leaves 

 lanceolate or lance-attenuate, 5 to 10 cm. long, 0.5 to 1.5 cm. broad, 

 acute, smooth-margined, glabrous on both surfaces ; sheath slightly in- 

 flated, 0.5 to 1 cm. long : inflorescence terminating the branches in 

 compound pedunculate umbels ; bracts small, 3 mm. or less in length ; 

 peduncles and pedicels glabrous and, as well as the calyx, purplish : 



