2957] 



THE BOTANY OF THE GUAYANA HIGHLAND— PART II 



389 



1. Macrophyllous shrubs with leaves normally 3-8 cm long, 2-5 cm broad; lateral 

 veins quite evident; involucre 8-12-seriate. 

 3. Leaf-blades usually 3-7 cm long, 1.0-2.5 cm broad; involucre cylindric- 



campanulate; phyllaries strigose-sericeous. 3. Stomatochaeta cylindrica. 



3. Leaf-blades usually 5-8 cm long, 3-5 cm broad; involucre broadly campanu- 



late; phyllaries glabrous. 4. Stomatochaeta crassifolia. 



1. Stomatochaeta condensata (Baker) Maguire & Wurdack,, comb. nov. 



Stifftia condensata Baker in Mart. Fl. Bras. 6 3 : 351. 18 84. 



Stenopadus condensatus (Baker) Blake, Bull. Torrey Club 67: 299. 1940. 



Stenopadus variabilis Blake, Brittonia 3: 202. 1939. 



Stenopadus guai quinimensi s Badillo, Bol. Soc. Venez. Ci. Nat. 9: 136. 1944. 



TYPE: "Habitat in Guiana Britannica: Rob. Schomb. N. 543!" (K). [Prob- 

 ably collected in Venezuela.] 



Distribution. Widely distributed on open savannas, about thickets, and as a 

 component of low brushland, Holi-tipu and the Ayanganna Savannas, British 

 Guiana; the Gran Sabana and Cerro Guaiquinima, Venezuela, from 800 to 2000 m 

 altitude on sandstone areas. 



2. Stomatochaeta cymbifolia (Blake) Maguire & Wurdack, comb. nov. 

 Stenopadus cymbifolius Blake, Brittonia 3:201. 1939- 



TYPE: Auyan-tepui, at 2200 m altitude, Edo. Bolivar, Venezuela, December 

 1937-January 1938, Tate 1322 (NY). 



Distribution. Known only by the type from Auyan-tepui and from the nearby 

 Chimanta-tepui* where the small shrub is generally distributed on the cumbre 

 above 2000 m altitude. Obviously most closely related to S. condensata. 



3. Stomatochaeta cylindrica Maguire & Wurdack, sp. nov. (Fig. 72.) 



Frutex, 2-5 m alto, ramulis 2-3 m diam., dense compacteque fulvo-strigulosis, 

 cum pilis malpighioideis; laminis glabris basibus costis exceptis, coriaceis, 

 (2.5)-3-7(9) cm longis; 1.0-2.5 (3.2) cm latis, oblanceolatis, rotundatis obtusis 

 vel acutiusculis apicibus, basibus acutis; improroinule pinnivenosis supra, promi- 

 nulis subtus, venis 4-6-jugis, marginibus costato-involutis; petiolis 5-10 mm 

 longis, strigulosis; capitulis cylindrico-campanulatis 8-15-floris homogamis; 

 involucro 3.0-3.5 cm longo, 6-7 mm basi lato; phyllariis 35-40, 10-12-seriatis, 

 gradatis, externe fulvo-strigoso-sericeis, inferioribus deltoideis ovatis 2-10 mm 

 longis, interioribus lineari-lanceolatis attenuato-acuminatis, 12-30 mm longis; 

 paleis receptaculi 1-2; phyllariis 2-3 marginalibus angustis; tubis corollae 6-7 

 mm longis glabris, piloso-hirsutis in collari intus; lobis linearibus 18-20 mm 

 longis, ca. 0.4 mm latis, rigidis, erectis, 2-venosis, cum appendicibus triangula- 

 ribus asperulis 5-6 mm longis; antheris 12-13 mm longis, appendicibus cauda- 

 libus linearibus ca. 3 mm longis connatis; achaeniis 6.0-6.5 mm longis, obscure 



4- angulatis, glabris, annulis ca. 0.5 mm longis; pappo sordido ca. 20 mm longo, 



5- 6-seriato; setis delicate filiformibus, minute barbellatis supra. 



TYPE: small flexuous tree 2-5 m high, flowers yellowish, fewer than 15, 

 occasional about "bush islands" in Stegolepis savanna, 1 km east Cumbre Camp, 

 at 1800 m altitude, Cerro Guaiquinima, Edo. Bolivar, Venezuela, Dec. 26, 1951, 

 Bassett Maguire 32782 (NY). 



Besides the type, known otherwise also only from the cumbre of Guaiquinima, 

 where it is conspicuous about thickets of forest margins: Maguire 32728, 32855, 

 33003, 33062. 



4. Stomatochaeta crassifolia (Blake) Maguire & Wurdack, comb. mov. 

 Stenopadus crassifolius Blake, Bull. Torrey Club 58:493. 1932. 



TYPE: Central Camp at 5000 feet altitude, Cerro Duida, Amazonas, Vene- 



