1963] 



BOTANY OF THE GUAYANA HIGHLANDS PART V 



25 



dense longeque ciliatis, alibi glabris; laminis teretibus, subulato-acuminatis, 



0. 8-1.3 mm diametro. glabris, laevibus vel ex sicco plus minusve sulcatis, pallido- 

 punctulatis; seapo 10-25 cm alto, 0.6-1.0 mm diametro, tereti. eeostato, glabro ; 

 vagina seapi eis foliorum simili, brevissime laminata : spiea obovoidea, 7-8 mm 

 longa. pluriflora. tomento albido longo fere omnino occulta ; bracteis basilaribus 

 haud vel vix reduetis. alteris ovatis, acutis. sepala subaequantibus, area dorsali 

 magna angusta praeditis; sepalis lateralibus liberis, lanceolatis. aeuminatis. 

 4.5-5.5 mm longis, carinatis. ad apicem versus sparse ciliatis ; placentis per- 

 juvenilibus ignotis. 



Key to the Subspecies of Xyris wurdackii 



1. Leaves longitudinally punetate-striate, much exceeding the scapes in length ; bracts 



narrowly triangularly lanceolate. subsp. wurdackii. 



L Leaves neither punctate nor striate, equaling or shorter than the scapes; bracts 



lanceolate, with curved margins. subsp. caquetensis. 



Xyris wurdackii subsp. wurdackii. Fig. 9, A-E. 



Laminis longitudinale striate pallido-punetulatis, quam scapis longioribus ; 

 bracteis anguste triangularibus, persistente dense tomentosis. 



Type. Yavita-Pimiehm trail near Pimichm, alt. 140 m, Rio Guainia, 22 Nov 

 1953, Amazonas, Venezuela, B. Maguire, J. J. Wurdack i(- G. S. Bunting 36366 A 

 (holotype NY, isotype US). 



Distribution. Known only by the type collection. 



Xyris Wurdackii subsp. caquetensis Maguire & Smith, subsp. nov. 



Laminis laevibus non punctulatis, quam scapis brevioribus vel subaequalibus ; 

 bracteis lanceolatis. glabrescentibus. 



Type. Frequent in scrub savanna, Araracuara. Rio Caqueta, 5 Sep 1959, 

 Amazonas, Colombia. B. Maguire, C. K. Maguire & A. Fernandez 44129 (holo- 

 type NY, isotype US). Paratype. Araracuara Savannas, 6 Sep 1959, 44173. 



Distribution. Known only from the type locality. 



Specimens of subsp. wurdackii are readily distinguished from the Caqueta 

 variant by their coarser, longer, fewer leaves, fewer scapes (1 or 2, in subsp. 

 caquetensis commonly 3-5), and persistently densely tomentose, narrower bracts, 

 which in the Colombian variant are broader and become at length somewhat 

 glabrescent. 



36. Xyris aquatica Idrobo & Smith, Caldasia 6: 206. /. 9. 1954. 



Type. On rocks in swift brook, Rio Caqueta, vicinity of La Pedrera, Apr 1924, 

 Amazonas, Colombia, R. E. Sckultes 5855 (holotype COL, isotype US). Paratype. 

 Rio Marmellos, Jul 1948, Amazonas, Brazil, B. E. Schultes c(- F. Lopez 10307 

 (US). 



Distribution. Known only by the cited specimens. 



37. Xyris terrestris Idrobo & Smith, Caldasia 6 : 208, /. 10. 1954. 



Type. Cerro de Caenda (sabanas), alt. 380-670 m, Rio Kubiyu. 4 Nov 1952, 

 Vaupes, Colombia, H. Garcia-Barriga 15090 (holotype COL, isotype US). Para- 

 types. Rio Karuru. Vaupes, Schultes & Cabrera 19179 (COL) ; Rio Kuduyari, 

 Vaupes, Schultes d' Cabrera 14235-A (COL). 



Distribution. Known only from Vaupes, Colombia. 



