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30 FIELDIANA: BOTANY, VOLUME 28
glume 2.5-3.5 mm. long, usually obtuse, 3-nerved, scabrous; second
glume and sterile lemma equal, obtuse, 5-nerved, scabrous; fruit 3
mm. long, acute, glabrous, the wings 1 ram. long, narrow, the tip
rounded.
Type in U.S. Nat. Herb., no. 1,9.11,650, collected on Cerro Duida,
southeastern-facing sandstone bluffs near Cano Negro (tributary of
Cano Iguapo), Territorio Federal Amazonas, alt. 1095-1520 m. t
August 26, 1944, Julian A. Steyermark 58020.
Related to the preceding, but readily distinguished by the elongate
blades, long attenuate to the base.
Ichnanthus serratus Swallen, sp. nov.
Perennis; culmi erecti, 55 cm. alti, scabri; vaginae carinatae,
pilosae; ligula ciliata, ca. 1 mm. longa; laminae 30 cm. longae, 4-5
mm. latae, acuminatae, pungentes, basi attenuatae, supra basi sparse
pilosae, marginibus scabris, hispidis; paniculae 13 cm. longae, 8 cm.
latae, ramis fasciculatis scabris, adscendentibus vel patentibus;
spiculae 3-3*2 mm. longae, pedicellis gracilibus appressis; gluma
prima 2-2.5 mm. longa, 1-3-nervis, scabra; gluma secunda et lemma
sterile aequalia, scabra, subobtusa; fructus 2.8 mm. longus, minute
acutus, glaber, lucidus, alis 1.2 mm. longis, hyalinis, angustis,
obtusis.
Perennial; culms erect, 55 cm. high, scabrous; leaves mostly
crowded toward the base, the culm leaves 2, the upper one much reduced;
sheaths keeled, rather densely pilose on the margins, sparsely
so on the back; ligule ciliate about 1 mm. long; blades about 30
cm. long, 4-5 mm. wide, thick, firm, erect, long attenuate to a narrow
base as wide as the mouth of the sheath, acuminate to a stiff rounded
point, sparsely pilose on the upper surface toward the base, otherwise
glabrous or nearly so on the surfaces, the margins thickened,
scabrous with small irregular antrorsely hispid protuberances; panicle
13 cm. long, about 8 cm. wide, the scabrous branches fascicled,
ascending or spreading; spikelets 3-3.2 mm. long on rather long
slender appressed pedicels; first glume 2-2.5 mm. long, 1-3-nerved,
scabrous; second glume and sterile lemma equal or the glume a little
longer, scabrous, subobtuse, tinged with purple; fruit 2.8 mm. long,
minutely pointed, glabrous, shining, the wings about 1.2 ram. long,
thin, narrow, obtuse.
Type in U.S. Nat. Herb., no. 1,911,653, collected on summit of
Cerro Duida, Savanna Hills, Territorio Federal Amazonas, alt. 1025-
1200 ra., September 2, 1944, Julian A. Steyermark 58298.
This species can be distinguished from all others known by the
stiff firm leaves and peculiar serrate margins of the blades.