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118 FIELDIANA: BOTANY, VOLUME 28
the apex, ciliate-raargined and more or less pilose on the inner surface
near the margins and apex, bearded at the apex, with a small
black gland in the center near the apex; ovary very small; style very
short; stigmas 2, erect-recurved.
Type in herb. New York Botanical Garden, collected in water of
swamp on the summit of Mount Roraima, on southern half of the summit
between Summit Camp, Great Central Rift, Central Swamp, and
pond at southern end, state of Bolivar, alt. 2700-2740 m., September
28, 1944, Julian A. Steyermark 58868. The collector notes: "heads
dull white; bracts dull blackish."
Leiothrix Steyermarkii Moldenke, sp. nov.
Herba perennis caulescens; caulibus usque ad 15 cm. longis, 1
crassis, furcatis dense foliosis, ad apicem dense longeque villosis;
foliis linearibus 4-5 cm. longis recurvato-patentibus ca. 1 mm. latis
obtusis utrinque sparse pilosulis vel glabrescentibus; vaginis gracilibus
arete adpressis 4-6 cm. longis sparse pilosulis multis triads
tortis; pedunculis 1 vel paucis 35-46 cm. longis glabris 3-costatis
tort is, ad apicem adpresso-pilosis.
Caulescent perennial herb, growing in dense tufts; stems to about
15 cm. long, about 1 cm. thick, usually only once forked near the
base, very densely leafy and entirely hidden by the sheathing and
closely imbricate leaf-bases, densely long-pilose with white villous
hairs at the apex; leaves pale green, very numerous, linear, 4-5 cm.
long, recurved-spreading, about 1 mm. wide, blunt, sparsely and irregularly
pilosulous on both surfaces or glabrescent, thin-textured
but not fenestrate, the midrib rather prominulous beneath, the margins
sometimes slightly revolute; sheaths very slender, closely
appressed to the peduncles, usually slightly surpassing the leaves,
4-o cm. long, rather sparsely pilosulous with simple whitish or capitate
gland-tipped rather spreading hairs, many-striate, somewhat
twisted, the apex obliquely split, the blades lanceolate-Ungulate,
appressed-pilosulous and often somewhat cilia te, about 5 mm. long,
erect, blunt; peduncles slender, 1 or a few at the apex of each
branch, 35-46 cm. long, glabrous or practically so, 3-costate, twisted,
more or less appressed-pilose just beneath the head; heads hemispheric,
7-8 mm. wide, creamy-white; involucral bractlets lightstramineous
or buff, oblanceolate, usually very concave on the inner
and convex on the outer surface, about 2.5 mm. long and 1.5 mm.
wide, readily splitting at the very abruptly rounded apex, glabrous
throughout, shiny; receptacle densely long-pilose; receptacular bractlets
none; staminate florets: sepals 3, separate almost to the base,
hyaline, narrowly elliptic-falcate, 2.3-2.6 mm. long, about 0.6 mm.
wide, more or less conduplicate-navicular, glabrous throughout, not
bearded, not glanduliferous; petals 3, united into a slender tube about
1.5 mm. long, glabrous, stramineous, the free terminal lobes hyaline,
about 0.6 mm. long, involute, glabrous, not glanduliferous; stamens 3,
included; anthers white; pistillate florets: sepals 3, separate practi-
cm.