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112 FIELDIANA: BOTANY, VOLUME 28 omnibus glabris, area dorsal! nulla; sepalis late rail bus fere aequilateris, late lanceolatis, ala carinali e basi ad apicem manifeste s cabrid ulo-c ilia ta. Type in herb. Chi. Nat. Hist. Mus., collected around rills on rocky dry ridge top, summit of Cerro Duida, Brocchinia Hills, Territorio Federal Amazonas, alt. 1700-1980 ni., September 1, 1944, Julian A. Steyermark 58168; same locality, but in slightly more moist places, Steyermark 58178. The last collection, although sterile, is undoubtedly referable to this new species. It has leaves up to 40 cm. long, and the sheaths at the base are much more conspicuously scabridulous than in the type specimen. This species is related to X. stenophylloides Malme, also from the summit of Duida, and to X, stenophylla Alb. Nils son. It is characterized by the scabridulous-ciliolate keel of the lateral sepals, the torulose leaves and scapes, small few-flowered heads with dark brown bracts without a dorsal area, the purple sheaths of the flowering scapes, and the strongly sulcate-nerved leaves and scapes. From X. stenophylloides it may be distinguished by the scabridciliolate, instead of entire eciliate keel of the lateral sepal, purlish instead of brown sheaths of the scape, and scabridulous instead of glabrous leaf sheaths. From X. stenophylla it differs in the shorter, more rigid, and more prolonged leaf sheaths, scabrid instead of ciliate leaf sheaths, and shorter differently shaped lower bracts of the heads. Xyris setigera Oliver, var. elongata Steyermark, var. nov. A typo differt foliis longioribus et marginibus ciliatis brevioribus remotioribus. Leaves 15-30 cm. long, the margins with shorter and less crowded cilia than in the species. Type in herb. Chi. Nat. Hist. Mus., collected on dry sandy and rocky sandstone exposures on level ground adjacent to swamp on plateau portion of southeast-facing slopes, Ptari-tepui' state of Bolivar, alt. 1600 m., November 1, 1944, Julian A, Steyermark 59660; Ptari-tepui, Brocchinia-Stegolepis-Heliamphora swamp on southwest-facing shoulder, alt. 2200 m., November 2, 1944, Steyermark 59782; swampy ground following streamlet, Gran Sabana, between Mission of Santa Teresita de Kavanayen northwest to Rio Karuai, on large mesa, alt. 1220 m., October 26, 1944, Steyermark 59336a; and savanna, vicinity of "Misia Kathy Camp", on mesa between Ptari-tepui and Sororopan-tepui, alt. 1615 m., November 15-17, 1944, Steyermark 60239. From typical X. setigera Oliver of Mount Roraima, this variety has become differentiated by elongating the leaves and in reducing the size and number of the cilia on the leaf margins.
BOTANICAL EXPLORATION IN VENEZUELA - I 113 Xyris stenostachya Steyermark, sp. nov. Caespitosa; foliis ensiformi-linearibus complanatis valde transverse rugulosis, glabris, 10-15 cm. longis, 2-3 mm. latis, marginibus incrassatis; vagina membranacea, brevi, glabra; scapis tenuibus subteretibus transverse rugulosis, 17-30 cm. longis, 0.5-0.6 mm. crass is; spicis lineari-cylindricis, acutis vel subacutis, 20-26-floris, 16-34 mm. longis, 2.5-3 mm. latis; bracteis firme membranaceis, pallido-viridibus, marginibus pallid o-brunne is subscariosis, integerrimis, ovato- vel elliptic o-oblongis, apice obtusis vel rotundatis, 7 mm. longis, 3 mm. latis, area dors all bene evoluta; sepalis lateralibus liberis, lanceolatis, acutis, 5.25-5.5 mm. longis, 0.8-1 mm. latis, ala carinali parce et minute ciliolata, aliter glabra; petalis oblongis, apice irregulariter eroso-dentatis, 3 mm. longis, circiter 1 mm. latis; filamentis 1 mm. longis, glabris; antheris 0.7 mm. longis; staminodii ramis penicillatis (Fig. 16, k-1). Type in herb. Chi. Nat. Hist. Mus., collected among rock outcrops below mouth of Rio Sanariapo, along Orinoco river, Territorio Federal Amazonas, alt. 100 m., September 8, 1944, Julian A. Steyermark 58437. A member of subgenus Nematopus Seubert, Sect. IV. of Malme (X. para en sis), this species is closely related to X. longiceps Malme, from which it differs in the transversely rugulose leaves and scapes, and longer and more slender spikes. It is also related to X. savannensis Miquel, differing from that species in the more elongated narrow spikes.
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o 2 CM XI E> RAR.Y OF THL UNIVERSIT
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FIELDIANA: BOTANY A Continuation of
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NUMBER 1 LIST OF ILLUSTRATIONS TEXT
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PAGE 67. Emmotum ptarianum 342 68.
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CONTRIBUTIONS TO THE FLORA OF VENEZ
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BOTANICAL EXPLORATION IN VENEZUELA
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