tween D.sqguarrosa and D.trichocarpa. As shown by a 
photograph in the Ames Herbarium of Hartweg’s speci- 
men in the Lindley Herbarium, D. squarrosa is vege- 
tatively characterized by its short, linear, obtuse and 
apiculate, strongly reflexed and usually twisted leaves 
(fig. 8c). The leaves of D.trichocarpa (fig. 1c) and XD. 
intermedia are typically tapering to the long-apiculate to 
subacuminate apex. The suborbicular floral bracts of J. 
squarrosa (fig. 8d) are only shortly apiculate instead of 
being shortly acuminate and strongly recurved as in J. 
trichocarpa and in most specimens of XD. intermedia. 
Florally, D. squarrosa has a longer column (4 mm. or 
more long) (fig. 8a) which is provided with a prominent 
pendent or projecting, hairy, ventrally placed ligule, 
whereas the column of D. trichocarpa (fig. 1a) and XD. 
intermedia (fig. 2a) is 4 mm. or less long and is eligulate 
or has only a small erect glabrous or nearly glabrous lig- 
ule. The petals of D.squarrosa are cuneate and more or 
less truncate at the apex and the fleshy lip (fig. 8b) is 
cuneate-flabellate in outline, whereas the petals of D. 
trichocarpa and XD. intermedia are obtuse and apiculate 
to acute, and the lower half of the lip is typically broadly 
rounded and concave. 
Dichaea squarrosa, D.trichocarpa and X D.intermedia 
comprise a closely allied group of plants. These concepts 
ure easily distinguished from D. muricata and its variety 
neglecta (Schltr. ) Kriinzl. (with which they are sometimes 
confused) by their linear to linear-lanceolate, usually 
strongly reflexed leaves which are not at all decurrent on 
the leaf-sheaths. Furthermore the leaf-sheaths do not 
noticeably clasp the stem as in D. muricata and its vari- 
ety neglecta. Instead, the lamina of the leaf is produced 
at the apex of the leaf-sheaths. 
Dichaea squarrosa, on the basis of the specimens we 
have seen, is confined to Mexico, Guatemala, Salvador 
[ 78 | 
