432 Journal of Agricultural Research voi. xiii, no. s 



ined, and in no case was there any notable variation in the presence and 

 distribution of "black glands," although there was a great difference 

 (often as great within species as between them) in their size and promi- 

 nence. None of these specimens possessed roots. The names of the 

 species examined follow : 



Gossypiumarboreumh-'yC. barbadense L. ; G. brasiliense Macf. ; G. herbaceum L; G. 

 hirsutum L.; G. mexicanuniTod.; G. nanking'Meyen; G. microcarpum Tod.; G. obhisi- 

 folium wightiana Watt; G. palmeri Watt; G. peruvianum Cav.; G. religiosum Roxb.; 

 G. schottii Walt; G. tomentosum Nutt. ; G. neglectum Tod.; G. wightianum Tod.: all 

 from the Economic Herbarium, Bureau of Plant Industry, and classified according to 

 Watt (z5). G.drynarioidesSQ&ma.n;G. harknessii Brandg.; G. davidsonii Kellogg: at 

 the Natioani Herbarium. 



That the chemical nature of the contents of the glands of these various 

 species is identical by no means follows; Perkin (9, 11) has demonstrated 

 marked distinctions in the flavone content of the flowers of G. neglectum, 

 G. arboreuin, and G. sanguineum. 



presence; of internaiv gIvAnds in genera closely related to 



gossypium 



Internal glands, such as are here described, have been noted within the 

 Malvaceae only in certain genera of the subfamily Hibisceae. Senra, 

 Lagunaria, Hibiscus, Abelmoschus, Kosteletzkia, and Dicellostyles 

 appear not to possess glands of this type. Thespesia, Cienfuegosia 

 (Fugosia), Erioxylon, and Ingenhouzia (Thurberia) are all more or less 

 glandulate. The arrangement of glands in Arizona wild cotton {Ingen- 

 houzia iriiobaM.og, and Sesse; syn. Thurberia thespesiodes A. Gray) is iden- 

 tical with that of Gassy piuni spp., and the glands of the seed (Pi. 42, B) 

 react like those of that genus. Only a fragmentary specimen, consisting 

 of stem, leaf, and flower of Erioxylon aridum Rose and Standley, has been 

 seen by the present writers; on this the gland arrangement was also like 

 that in Gossypium spp. 



Four specimens of Thespesia spp. (T. lampas D. and E. ; T. populnea 

 Soland; T.macrophylla Blmne and T. grandiflora D. C.) showed similar 

 glands, but their arrangement was much less definite, and their presence 

 (in herbarium specimens) sometimes could only be demonstrated by 

 reagents. In contradistinction to the description of Thespesia by 

 Schumann {13). 



Kelch nicht punktiert, 



the calyx of the two first species showed well-defined though incon- 

 spicuous glands. Seeds of both were densely glandulate, and the glands 

 gave the gossypol-red reaction. Cienfuegosia is differentiated by 

 Schumann (i j) in part thus : 



Kelch schwarz ptmktiert * * * Kotyledonen nicht ptmktiert. 



Seven specimens were available for examination; only two specimens, 

 C (Fugosia) drummondii lycwtonand C. phlomidifolia Garcke, possessed 



