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MEMOIRS OF THE NEW YORK BOTANICAL GARDEN 



[VOL. 10 



basic distinctions from M. rigida Benth. enumerated in the original description 



of M. neblinae. 



Tibouchina llanorum Wurdack, sp. now 



Sect. Barbigerae. Ex sectionis congeneribus differt hypanthii squamis incurvo- 

 patentibus. 



Suffrutex ad 1.5 m altus; rami acute 4- vel 6-angulati petiolis inflorescenti- 

 isque dense vel modice squamis vix ciliolatis basi inferne productis armati. Folia 

 opposita vel ternata ; petioli 0.5-1 cm longi ; lamina plerumque 7-12 X 4-6 cm 

 elliptico-ovata apice late acuta basi rotundata rigidiuscula supra modice strig- 

 ulosa pilis ad apicem liberum ciliolatis subtus in nervis dense squamis appressis 

 subintegris (inconspicue appresso-ciliolatis) obsita in superficie densissime 

 strigulosa squamis ciliolatis 5- vel sub-7-nervata nervis primariis lateralibus basi 

 non coalitis. Panicula 4-20 cm longa oblonga ; flores in ramulis brevibus conf erti 

 2-4 mm pedicellati; pedicelli ad basim plerumque bibracteolati ; bracteolae 

 4-6 X 4-6 mm late ovatae vel suborbiculares apice obtusae vel rotundatae extus 

 centraliter densiuscule ciliolato-squamulosae intus glabrae persistentes. Hypan- 

 thium (ad torum) 6-8 X 4-5 mm dense squamis lanceolatis 1.5-2 mm longis 

 incurvo-patentibus inconspicue appresseque ciliolatis obsitum. Calycis tubus ca. 

 0.5 mm altus, lobis 2.5 mm longis late ovatis basi contiguis extus centraliter 

 modice squamulosis. Petala rosea 13 X 12 mm obovata apice truncata vel vix 

 emarginata. Stamina vix dimorphica ; filamenta 9-11 mm longa basim versus 

 densiuscule setosa pilis gracilibus ad 5 mm longis; antherarum thecae 9.5-10.5 

 mm longae, connectivo basi 2 vel 3 mm prolongato ventraliter non prolongato 

 sed ad basim ipsum dense setoso pilis gracilibus ad 3.5 mm longis. Stylus glaber ; 

 stigma punctiforme ; ovarium apice dense sericeo-strigosum. 



Type : Sabanas between San Carlos and Acarigua, Cojedes, Venezuela, 15 Sep 

 1940, C. E. Chardon 223 (holotype US 1801638). Paratopes. VENEZUELA. 

 Cojedes: savannas between El Tinaco and San Carlos, Pittier 12003. Carabobo: 

 beside Lago Valencia, alt. 700 m, Hermano Gines 4443. Bolivar : morichal margins 

 near Pilon 5 km northeast of mouth of Rio Parguaza, alt. 90 m, Wurdack & 

 Monachino 41128. COLOMBIA. Meta : sabana near Villavicencio "cerca de 

 Peralonso, " alt. 450 m, Jaramillo, Mesa, Idrobo, & Fernandez 333. 



In the past, T. llanorum has been confused with T. karstenii Cogn. and T. 

 barbigera (Naud.) Baill., both of which have generally smaller leaves and strictly 

 appressed calyx pubescence as well as hypanthia only about 3-3.5 mm diam. The 

 photograph (Gleason 88-1) of the Kew sheet of Linden 1455 indicates that this 

 collection, the basis of Cogniaux' Colombian record of the otherwise Brazilian 

 and Bolivian T. barbigera, is actually T. llanorum. However, the recent Co- 

 lombian material of T. karstenii (Cuatrecasas 7659 from San Jose de Guaviare 

 and Garcia-Barriga 11058 from between San Francisco and Supate, Cundinam- 

 arca) shows basally sparsely strigose filaments, although otherwise agreeing 

 closely with the type photograph (Macbride 32307). Establishment of criteria 

 other than filament pubescence for the distinctions (if any) between T. barbigera 

 and T. karstenii depends upon close examination of types not on hand at present. 

 The loose hypanthial scales "of T. llanorum serve as an ample distinction from 

 its two relatives. Cogniaux' use of opposite versus ternate leaves in Sect. 

 Barbigerae as a species-group criterion is certainly suspect in light of the 

 variability seen in T. llanorum; Pittier 12003 (US) has 3-whorled leaves, while 

 one of the five duplicates in Wurdack & Monachino 41128 has ternate leaves (with 

 6-angled stems) and the others opposite leaves (with 4-angled stems). 



