BOTANY OF THE GUAYAXA HIGHLANDS PART V 



L5 



46. Leaf-sheaths ciliate. 



49. Scapes bicostate, eiliate on the costae; basal bracts much less 



than half the length of the spike. 50. X. bicostata. 



49. Scapes ecostate, glabrous. 



50. Sepals equaling the bracts, sparsely and minutely ciliate on 



the keel. 51. X. filiscapa. 



50. Sepals exceeding the bracts, glabrous. 52. X. steyermarkii. 



44. Lateral sepals connate. 



51. Spikes 2-3-flowered; sepals carinate. 53. X. connosepala. 



51. Spikes 1-flowered ; sepals ecarinate. 54. X. subuni flora. 



. Spikes more than 3-flowered or the bracts ciliate. 

 52. Basal bracts about half as long as the spike. 



53. Sepals red-pilose toward the apex; spike 8-10 mm long. 8. X. seubertii. 

 53. Sepals not more than minutely ciliate ; spike smaller. 



54. Bracts glabrous; scape terete or subterete. 55. X. rubrolimbata. 



54. Bracts ciliate. 



55. Fertile bracts acute; sepals equilateral. 56. X. applanata. 



55. Fertile bracts broadly rounded ; sepals inequilateral. 

 56. Sepals free; dorsal area nearly as long as the bracts. 



57. X duidensis. 

 56. Sepals short-connate; dorsal area not more than half as 



long as the upper bracts; flowers polystichous. 7. X. uleana. 



52. Basal bracts much less than half as long as the spike. 



57. Dorsal area occupying most of the bract ; leaves and scape rugulose. 

 58. Scape much flattened toward the apex; scape, young and often 



mature leaf -blades densely long-eiliate. 58. X. surinamensis. 



58. Scape subterete; scape and leaf -blades glabrous. 59. X. frequens. 

 57. Dorsal area relatively small. 



59. Leaf-sheaths dark-castaneous at least at the base, mostly lustrous. 

 60. Blades abruptly narrower than the sheaths; flowers decussate, 



4-5-ranked. 60. X. contracta. 



60. Blades merging with the sheaths. 



61. Plants long-caulescent; leaf -sheaths forming broad frond-like 



plates. 61. X. frondosa. 



61. Plants short-caulescent or acaulescent; leaf-sheaths not form- 

 ing broad plates. 

 62. Sheaths glabrous; blades 3.5-5 mm wide; bracts spirally 



arranged, broadly rounded. 62. X. teinosperma. 



62. Sheaths ciliate; blades 0.7-2 mm wide. 



63. Bracts dark ; blades 2 mm wide ; sheaths gradually wid- 

 ened toward the base. 63. X. pratensis. 

 63. Bracts pale; blades 0.7 mm wide; sheaths abruptly 

 orbicular-dilated at the base making the plant subbulbous. 



64. X. araracuarae. 



59. Leaf-sheaths pale, opaque. 



64. Leaf -sheaths basally densely long-ciliate. 



65. Bracts carinate toward the apex. 65. X. carinata. 



65. Bracts broadly convex, ecarinate. 

 66. Leaf -sheaths rugulose; blades tuberculate-ciliate. 



23. X. set ig era. 



66. Leaf-sheaths and blades sulcate, otherwise even. 



66. X. malmeana. 



64. Leaf -sheaths eciliate. 



67. Spike acute; bracts subacute. 



68. Plant caulescent ; sheath ligulate. 67. X. cuatrecasana. 



68. Plant acaulescent; sheath eligulate. 68. X. yutajensis. 

 67. Spike broadly obtuse ; bracts subtruncate. 



69. Bracts soon lacerate. 69. X. lacerata. 

 69. Bracts entire. 



70. Sepals subequilateral, lanceolate. 70. X. subglabrata. 



70. Sepals strongly inequilateral, semi-elliptic. 



