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22 FIELDIANA: BOTANY, VOLUME 28
Paspalum aureolatum Swallen, sp. nov.
Perenne; culmi erecti, 75 cm. aki, glabri; vaginae elongatae,
glabrae vel summo sparse papilloso-hispidae, superiores internodiis
breviores; ligula 3.5-4 mm. longae; laminae 20-30 cm. longae, usque
ad 7 mm. latae, scaberulae, marginibus basi sparse hispido-ciliatis;
racemi 4, 7.5-8 cm. longi, patentes, basi barbati; rachis 5-5.5 ram.
lata, supra spiculas producto; gluma secunda 5.3 mm. longa, ovata,
truncata, hyalina, 3-5-nervis, scaberula, basi pilosa, summo hispidula;
lemma sterile glumam secundam aequans, 3-nerve, dorso
glabrum, marginibus papilloso-hispido-ciliatis; fructus 3.8-4.2 mm.
longus, scipitatus, marginibus hispidis, summo hispidulus; palea
g la bra.
Perennial; culms erect, 75 cm. high, glabrous; sheaths elongate,
glabrous or sparsely papillose-hispid near the summit, the lower
much longer than the internodes, the upper shorter; ligule conspicuous,
reddish brown, the lower ones 3.5-4 mm. long; blades 20-30 cm.
long, as much as 7 mm. wide, scaberulous, the margins sparsely
hispid-ciliate toward the base; racemes 4, crowded on a short axis,
7.5-8 cm. long spreading, bearded at the base, the rachis 5-5.5 mm.
wide, extending beyond the spikelets; second glume 5.3 mm. long,
ovate, thin, 3-5-nerved, the nerves fine, more or less transversely
nerved, scaberulous, hairy across the back at the base, shortly
hispid near the truncate tip; sterile lemma as long as the second
glume, 3-nerved, glabrous on the back, the margins papillose-hispid -
ciliate, sparsely so above the middle; fruit 3.8-4.2 mm. long, stipitate,
the margins hispid at the middle, the hairs rather long, the tip
shortly hispid; palea glabrous (Fig. 1).
Type in U.S. Nat. Herb., no. 1,911,652, collected on summit of
Cerro Duida, Savanna Hills, alt. 1025-1200 m., September 2, 1944,
Julian A. Steyermark 58234.
The hispid fertile lemma distinguishes P. aureolatum from the
other species of the Dissecta group.
It is similar to P. contractual
which has bearded nodes, hispid foliage, a shorter ligule, about
1.5 mm. long, and usually only two racemes. The fruit is not more
than 3.4 mm. long, and lacks the long hairs on the margins of the
le mma.
Paspalum erectifolium Swallen, sp. nov.
Perenne; culmi erecti, 55-70 cm. alti, glabri vel scaberuli; vaginae
inferiores internodiis multo longiores, dense papilloso-hispidae,
superiores internodiis longiores vel breviores, glabrae vel marginibus
sparse pilosae; ligula membranacea, 1-1.5 mm. longa; laminae firmae,
appressae vel adscendentes, acutae, pungentes, pubescentes et
dense hispidae, marginibus papilloso-ciliatis, inferiores 5-7 cm.
longae, 7-12 mm. latae; racemi 2, approximati, 5-6 cm. longi, basi
dense pilosi, rachi 3-3.5 mm. lata, alata, glabra supra spiculas procurrente;
spiculae compressae, appressae; gluma secunda 5.6 mm.