DEC. 1907. SPERMATOPHYTES FROM MEXICO GREENMAN. 251 



of this very interesting genus the following collections in the 

 herbarium of the Field Museum represent further the above 

 species. MEXICO. State of Yucatan: Merida, April, 1865, 

 Dr. A. Schott, no. 217; Colonia San Cosme, 20 February, 1906, 

 J. M. Greenman, no. 348; Izamal, collection of 1888, Dr. Geo. F. 

 Gaumer, without number; Izamal, Dr. Geo. F. Gaunter, nos. 

 3001, 3002, 3004; Puerto Morelos, 12 to 31 March, 1901, E. A. 

 Goldman, no. 626 (hb. U. S. Nat. Mus. ; fragment in hb. Field 

 Mus.). 



Guatteria Gaumeri Greenman, sp. nov. Tree, 10 to 15 m. high: 

 stem and branches covered with a gray bark ; ultimate branchlets 

 glabrous or sparingly strigulose-puberulent : leaves alternate, 

 petiolate, lanceolate to elliptic-lanceolate, 5 to 15 cm. long, 2 

 to 2.5 cm. broad, usually short-acuminate and obtuse, rarely 

 retuse at the apex, entire, glabrous on both surfaces or in the 

 very early stages slightly pubescent with a few scattered appressed 

 hairs, soon glabrate and rather strongly reticulate-nerved; 

 petioles stoutish, 3 to 10 mm. long, canaliculate, often turning 

 blackish in the dried state: inflorescence terminal or lateral; 

 peduncles thickish, i to 3 cm. in length, jointed, sparingly pubes- 

 cent with appressed tawny hairs, bracteate at the base and 

 usually bearing a single ovate acute or acutish ciliate fer- 

 rugineous-pubescent bract below the middle: sepals subrotund, 

 3 to 5 mm. high, usually broader than long, ciliate and sparingly 

 pubescent to glabrous: petals large, oblong-ovate to some- 

 what obovate, 2 to 4.3 cm. long, 1.2 to 3 cm. broad, thick and 

 leathery: berries numerous, elliptic-obovoid, about i cm. long, 

 7 to 8 mm. in diameter, minutely verrucose, glabrous: stipes 

 slender, 1.5 cm. or less in length; torus somewhat depressed- 

 globose. MEXICO. State of Yucatan: vicinity of Izamal, 

 specimens communicated February, May, June, and July, 1906, 

 Dr. Geo. F. Gaumer (hb. Field Mus., catalogue nos. 189976-189- 

 978, 189160, 189161). In general appearance the species here 

 proposed resembles G. dolichopoda Donn. Sm., but it differs in 

 the less acuminate and blunt leaves, character of the pubescence, 

 subrotund sepals, larger petals, shorter peduncles and stipes. 



G. Gaumeri is rich throughout all its parts in oil-glands, and 

 when crushed it produces a pleasant aromatic odor. Dr. Gaumer 

 in whose honor the species is named states that the plant is known 

 about Izamal under the name of "Elemuy," and that from it 

 is obtained one of the most valuable medicines used in Yucatan. 



TRISTICHA HYPNOIDES Spreng. Syst. Veg. iv. pt. 2, 10 (1827); DC. 

 Prodr. xvii. 44 (1873) ; Hemsl. Biol. Cent. -Am. Bot. iii. 39 (1882). 

 Specimens well representing this species were found growing 

 on stones under water near Cordoba, State of Vera Cruz, Mexico, 

 25 January, 1906, /. M. Greenman, no. 124 (hb. Field Mus.). 

 This interesting species, known from Cuba, from Guatemala 

 to Brazil, from tropical and south Africa and Madagascar, seems 

 not to have been recorded hitherto from Mexico. Specimens 



