TROPICAL AMERICAN COMPOSITAE. \f 



volucri squamis ca. 12 subtriseriatis stramineis extimis ovatis acutius- 

 culis interioribus gradatim longioribus anguste ellipticis delicatule 

 striatulis apice obtusiusculis glabris; corollis 7 mm. longis sensim 

 sursum paiiUo ampliatis glabris; antheris fere liberis longiuscule 

 appendiculatis; achaeniis 3 mm. longis nigris lucidis obsolete granu- 

 latis; pappi setis ca. 30 inaequalibus stramineo-albidis. — Peru: 

 Province of Chachapoyas, 1835, Mathews, no. 1373 (K., phot. Gr.). 

 In form the involucre of this species is nearly cylindrical yet the scales 

 do not have the texture, nervation, or deciduous nature of § Cylindro- 

 ccphakt and it seems best placed in § Siibimhricata. 



E. (§ Subimbricata) Cookii, spec, nov., fruticosum dense villosum, 

 pilis primo longis gracillimis sub lente pulcherrime purpureo-articu- 

 latis tardius plus minusve attritis; caule tereti purpureo, internodiis 

 usque ad 13 cm. vel ultra longis; ramis patentibus vel divaricatis 

 plerisque curvato-adscendentibus ; foliis ovatis acuminatis crenato- 

 serratis (basi rotundata vel subcordata integra excepta) ima a basi 

 3(-o)-nervatis supra obscure A'iridibus et crispe puberulis subtus 

 paullo pallidioribus sordide pubescentibus et glandulari-atomiferis 

 3-6 cm. longis 1.8-3.6 mm. latis; petiolo 1-2 cm. longo; pedicellis 

 1-4 mm. longis; capitulis glomeratis ca. 22-floris 7 mm. altis 4 mm. 

 diametro; involucri campanulati ca. triseriati substraminei squamis 

 ca. 19 valde inaequalibus, interioribus anguste oblongis apice rotunda- 

 tis sed apiculatis saepe 2-costulatis viridibus vel purpureo-tinctis 

 saepissime dorso granulatis vel leviter puberulis, intermediis et 

 extimis gradatim brevioribus acuminatis ciliatis distinctius puberulis; 

 corollis albis 3.8 mm. longis, tubo proprio vix 0.8 mm. longo, faucibus 

 sensim ampliatis cylindricis, limbo hispidulo; achaeniis fusco-brunneis 

 1.5 mm. longis glabris; pappi setis ca. 27 laete albis minute scabidis. — 

 Peru: Dept. Cuzco: Lucumayo Valley, alt. 1800-3600 m., 19 June, 

 1915, 0. F. Cook & G. B. Gilbert, no. 1352 (type, U. S., phot. Gr.). 

 An old specimen, Mathews, no. 1126, collected at "Andimarca" and 

 now in the Kew Herbarium, is apparently of this species. It differs 

 chiefly in its shorter pubescence, which on the mature branches is 

 scarcely more than a somewhat glandular puberulence. However, 

 the longer and articulated pubescence, so copious on the Cook & 

 Gilbert specimen, is found to some extent on the younger petioles, 

 etc., of the Mathews plant, and its absence from the older parts may 

 well be due to some form of attrition, disarticulation, or absorption. 

 At all events, species have been noted elsewhere in the genus which 

 appear to pass from a stage with copious articulated and non-glandu- 

 lar pubescence to one in which glandular puberulence is prevalent. 



