1953] 



BOTANY OF THE GUAYANA HIGHLAND 



99 



stream bed, Culebra Creek, 1300 m. alt., Cerro Duida, Rio Cunucunuma, Maguire, 

 Cowan & Wurdack 29631. The species is also known from Cerro Guanay, Cerro 

 Sipapo, and Cerro Yavi, as well as from Auyan-tepui in Bolivar, from the state of 

 Lara, and from the Sierra de la Macarena in Colombia. 



Paepalanthus williamsii Moldenke. 



Occasional herb in moist places around border of Savanna No. Ill, 125 m. alt., 

 Cerro Yapacana, Rio Orinoco, Maguire, Cowan & Wurdack 30806; infrequent in wet 

 places, border of Savanna No. Ill, 125 m. alt., Maguire, Cowan & Wurdack 30463. 

 The species was hitherto known only from the Savanna de San Antonio, also in 

 Amazonas (Williams 15051) and from a recent collection in the state of Amazonas, 

 Brazil.' 



Syngonanthus alleni var. parvus Moldenke, var. nov. 



Kaec varietas a forma typica speciei recedit caulibus parvioribus, foliis gla- 

 bris attenuatis, bracteis paucis brevioribus, pedunculis paucioribus, et capitulis 

 florisque minoribus. 



TYPE; on shallow wet sand on rock outcrop behind (east of) Hotel Amazonas, 

 Puerto Ayacucho, Amazonas, Venezuela, October 24, 1950, B. Maguire, R. S. 

 Cowan & J. J. Wurdack 29238; New York Botanical Garden. The typical form of 

 the species is known only from Vaupes, Colombia. 



Syngonanthus anomalus (Korn.) Ruhl. 



Stamens white, frequent on marshy bank along river, 1 km. above Culebra Rap- 

 ids, Rio Cunucunuma, Rio Orinoco, Maguire, Cowan & Wurdack 30409. This spe- 

 cies is known from Amazonas and Bolivar, Venezuela, as well as from British 

 Guiana and from Amazonas, Brazil. Several rather poorly defined varieties and 

 forms have been described. 



Syngonanthus biformis (N. F. Br.) Gleason. 



Common on mossy moist sandy banks along rocks, Danta Falls, 150 m. alt., 

 Rio Cuao, Rio Orinoco, Maguire & Politi 21342; with white flowers, along stream 

 in rain forest, Cano Culebra, 1000-1100 m. alt., Cerro Duida, Rio Cunucunuma, 

 Maguire, Cowan & Wurdack 29518. The species is known from Colombia (Vaupes) 

 and Venezuela (Amazonas, Bolivar, and Sucre) to British Guiana and Surinam. 



Syngonanthus caulescens (Poir.) Ruhl. 



Moist sandy banks over rocks at Danta Falls, 460 feet alt., Cerro Sipapo 

 (Paraque), Maguire & Politi 21342a; frequent in moist sandy banks among rocks, 

 Danta Falls, Rio Cuao, Rio Orinoco, Maguire & Politi 21343a; infrequent along 

 sandy stream banks under Mauritia, 18 km. south of Santa Barbara, Monagas, 

 Maguire, Kunhardt & Politi 21299. The species is widely distributed in the New 

 World, from Mexico (Veracruz) through Costa Rica, Colombia (Cundinamarca, Meta, 

 Santander del Norte, and Vaupes), Venezuela (Amazonas, Anzoategui, Bolivar, 

 Carabobo, and Monagas), British Guiana, Surinam, and French Guiana to Peru 

 (San Martin), Brazil (Amapa, Amazonas, Bahia, Goyaz, Mattogrosso, Minas Geraes, 

 Parana, Pernambuco, Piauhy, Rio de Janeiro, Rio Grande do Sul, and Sao Paulo), 

 Bolivia (Santa Cruz), Paraguay, and Argentina (Corrientes and Misiones). 



Syngonanthus cowani Moldenke, sp. nov. 



Herba parva caulescens 2-8 cm. alta; caulibus simplicibus vel usque ad 3" 

 aggregatis gracilibus rigidis erectis atrobrunneis vel nigrescentibus marginatis 

 densiuscule laxeque pilosis; foliis caulinis verticillatis adscendente-erectis; 

 foliis basalibus numerosissimis dense rosulatis recurvo-reflexis anguste lineari- 

 bus rigidiusculis 8-12 mm. longis subulatis glabratis 1-nervatis; inflorescentiis 



