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32 FIELDIANA: BOTANY, VOLUME 28
parum evoluta), oblonga, apice obtusa et late rotundata, dorso 2-
carinata et late sulcata, inter carinas dense pubescens, extra carinas
praecipue apicem versus pilis subtilibus adpressis dense pubescens,
nervis inter carinas solitariis, alibi (demptis carinis) obscuris.
Rhachilla segmenta infra lemmata articulata, apice suboblique ubi
margine subtiliter ciliolata, idem inter flosculas compressa, clavata,
curvata, utrinque pilulis albidis antrorse strigosa vel latere uno
glabra alio strigosa, I (infra lemma infimum; parum compressum vel
parum sulcatum): 0.5-1 mm.; II: 1.5-2 mm.; Ill: ca. 2.5 m.; IV: ca.
FIGURE 3
Arthrostylidium Steyermarkii McClure, sp. nov. (Steyermark 59926)
A, Summit of leaf sheath, X 2.5; B, Spikelet, X 5; C, Floret, X 10;
D, Lemma, X 10; E-G, Glumes, I-HI, X 10.
The author's pencil sketches were inVed by Mrs. Agnes Chase.