TROPICAL AMERICAN COMPOSITAE. 9 
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 paullo 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- 
cephala and it seems best placed in § Subimbricata. 
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(-5)-nervatis supra obscure viridibus et crispe puberulis subtus 
paullo pallidioribus sordide pubescentibus et glandulari-atomiferis 
em. longis 1.8-3.6 mm. latis; petiolo 1-2 cm. longo; pedicellis 
14 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- 
ls 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 seabidis.— 
Perv: Dept. Cuzco: Lucumayo Valley, alt. 1800-3600 m., 19 June, 
1915, O. F. Cook & G. B. Gilbert, no. 1352 (ryPx, 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, 
ete., 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. 
. 
