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106 FIELDIANA: BOTANY, VOLUME 28 ff FIGURE 16 Xyris albescens Steyerraark. A, Tip of blade, showing recurved portion (X 1/3 >, B, Petal (X 1.5). Xyris esmeraldae Steyermark. spike (X 1.5). C, Upper part of flowering scape with Xyris lanulobractea Steyermark. D, Stamen (X 6); E, Portion of hairs at base of filament (highly magnified); F, Bract, showing dorsal area and pubescence at summit (X 3); G, Petal (X 1.5); H, Staminodium (X6). Xyris ptariana Steyermark. I, Petal (X 1); J, Cluster of uppermost leaves in position, showing recurved ligule (X 2/3). Xyris stenostachya Steyermark. K, Uppermost part of scape with spike (X 1); L, Middle part of blade (X 3).
BOTANICAL EXPLORATION IN VENEZUELA - I 107 Petals 8.5 mm. long, the blade 6 ram. long, 4 mm. wide, broadly elliptic-ovoid, subobtuse, margins erase from tip to near base, claw 3 mm. long; anther linear, 2.5 mm. long; filament 1 mm. long; staminodium long penicillate-plumose at apex with hairs 2 mm. long; style branches 3, 3 mm. long, slightly penicillate and truncate at tip (Fig. 16, a-b). Type in herb. Chi. Nat. Hist. Mus., collected on Ptari-tepui^ Bonnetia roraimae forest on southwest-facing shoulder, state of Bolivar, alt. 2000-2200 m., November 2, 1944, Julian A. Steyermark 59734. Also collected in swamp, Ptari-tepuf, on plateau portion of southeast-facing slopes, alt. 1600 m., November 1, 1944, Steyermark 59683. Apparently a member of Sect. XII (X. spe eta biles Malme) [published as Stirps X. spectabilis, but undoubtedly intended as plural, as all other sections are so designated by Malme with plural endingsj, and most closely related to X. decussata Gleason of Mount Roraima, which it resembles in the falcate-incurved rounded or obtuse leaf tips, pubescent margins of leaves and scapes, and decussate darkcolored bracts lacking a definite dorsal area. It differs from that species in the white instead of dark brown hairs of the margins of scapes and leaves, recurved-falcate inequilateral leaf tip, much longer leaves and scapes, more robust habit, larger heads, bracts, and lateral sepals, and longer sheaths of an orange-brown to dark castaneous brown color. In its strongly flattened, broad scape with pubescent margins of the leaves and scapes, it is reminescent of X, eriophylla Reichenb., but that has a definite dorsal area on die bracts, densely villous upper part of the lateral sepal, and transversely rugose leaves. Xyris c a pillar is Steyermark, sp. nov. Caespitosa; foliis rubrescentibus planis setaceis, acutis, 0.5-3 cm. longis, 0.1-0.2 mm. latis, omnino glaberrimis; vagina circiter tertiara vel feredimidium partemfolii occupante, basin versus pallidobrunnea, scariosa, eciliata; scapo subtereti tenuissimo, glabro, 1.5-1.9 cm. alto; spicis anguste ellipticis, 1-floris, 3-4 mm. longis, 0.8-1 ram. latis; bracteis membranaceis brunneis, 2 infimis brevissimis, anguste lanceolatis, 2-2.1 mm. longis, glabris, bracteis intermediis et superioribus lanceolatis, 3-4 ram. longis, albido-maculatis, marginibus scariosis; ovario et capsula uniloculari; seminibus plerumque 2. Leaves copper-colored; placentae basal-central, ovules numerous, attached to long, ascending funicles; seeds 2 or more, minute, ellipsoid, reddish-brown. Type in herb. Chi. Nat. Hist. Mus., collected between Esmeralda Savanna and southeastern base of Cerro Duida, Territorio Federal Amazonas, alt. 200 m., August 22, 1944, Julian A. Steyermark 57835.
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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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