1953] 



BOTANY OF THE GUAYANA HIGHLAND 



129 



longis ovatis compressis, cotyledonibus complanatis convolutis linearibus ca. 6 

 mm. longis carnosis, radicula brevi. 



TYPE: small tree 10 m. high, flowers pale yellow, occasional in savanna, 

 along open banks of lower Cano Negro, alt. 1500 m., Cerro Sipapo, Amazonas, 

 Venezuela, Jan. 1, 1949, Bassett Maguire & Louis Politi 28104; New York Bo- 

 tanical Garden. Paratypes: shrub to 3 m. high, petals pale yellowish, fruit deeply 

 2-3 lobed, savanna, Cano Negro, alt. 1500 m., Cerro Sipapo, Dec. 25, 1948, Ma- 

 guire & Politi 27946; small shrub to 2 m. high, petals pale cream with red mid- 

 vein, infrequent, marshes Cano Negro, 1500 m. alt., Cerro Sipapo, Maguire & 

 Politi 27692, 27692A. 



Pterandra flavescens is closely related to the low altitude rain-forest tree 

 P. arborea Ducke, of Amazonas, Brazil. This latter species has larger leaves and 

 smaller pink flowers. Fruiting material was not seen by Ducke. 



Tetrapteris fimbriata Juss. 



Flowers yellow, liana climbing to 20 m., opening along stream in montane 

 forest, Intermediate Camp, Cerro Sipapo, 600 m. alt., Feb. 2, 1949, Maguire & 

 Politi 28749, 28783. 



POLYGALACEAE 



Polygala sipapoana Wurdack, sp.nov. Sect. Timutua, Ser. Tenues. 



Radix parva fibrosa. Caulis simplex vel ad apicem ramosus, ad 3.5 dm. 

 longus, striatus, glaber. Folia lineari-oblonga vel lineari-obovata, acuminata vel 

 obtusa sparse pellucido-punctata glabra 5-8 mm. longa 1.3-2.5 mm. lata, inferiora 

 subverticillata superiora alterna. Racemi capitati vel breviter cylindrici 6-13 mm. 

 longi et lati, floribus inferioribus dilapsis saepe ad 40 mm. elongati, sub racemo 

 florente pedunculo incrassato. Flores rosei 4o5-5.0 mm. longi pedicellis 0.6-1.0 

 mm. longis. Sepala inaequalia; superiore ovato-elliptico obtuso vel breviter 

 obtuso-apiculato 1.7-1.9 mm. longo 0.9-1.2 mm. lato, ad basim 4-8 maculas cro- 

 ceas gerenti; duo inferiora obtusa elliptica 1.2-1.3 mm, longa 0.5-0.6 mm. lata, 

 ad basim maculas duas croceas gerentia; alae late ovatae vel ovato-ellipticae 

 obtusae 4.1-4.4 mm. longae 2.9-3.1 mm. latae 3- mox 4-5-nerviae ad basim 1-3 

 maculas croceas gerentes. Petala lateralia 3.3-3.5 mm. longa 1.0-1.2 mm. lata 

 ad carinam Vadhaerentia; carina angusta ca. 3.5 mm. longa (crista inclusa) infra 

 cristam croceo-maculata, crista e lobis 7-jugis, jugis ca. 1.2 mm. longis. Capsula 

 ovato-ellipti ?a obtusa haud emarginata ad septum croceo-maculata 2.5-2.9 mm. 

 longa 1.6-1.9 mm. lata; semen conicum in maturitate brunneo-sericeo-comosum 

 estrophiolatum 2.2-2.6 mm. longum (coma inclusa), coma 0.5-0.7 mm. longa. 



TYPE: annual with pale to dark purple flowers, occasional, upper East Basin, 

 Cerro Sipapo, Terr. Amazonas, Venezuela, alt. 1800 m., Jan. 14, 1949, Bassett 

 Maguire & Louis Politi 28352; New York Botanical Garden. Paratype: purple 

 flowered annual from wet places, Camp Savanna, alt. 1500 m., Dec. 6, 1948, Ma- 

 guire & Politi 27533. 



Closely related to three widespread species, P. longicaulis HBK., P. varia- 

 bilis HBK., and P. adenophora DC, but resembling superficially the first of 

 these most closely. From the first-mentioned species, P. sipapoana may be dis- 

 tinguished by the broadly ovate soon 4-5-nerved non-cuspidate wings and obtuse 

 to bluntly mucronate upper outer sepal; from the second, it differs in the broader 

 leaves and larger flowers; from both, P. sipapoana may be separated by the large 

 ornate crest of 7 rather than 3-4 pairs of lobes and the estrophiolate seeds. P. 

 adenophora differs in having narrower leaves, narrowly elliptic alae, and a much 

 larger keel which exceeds the wings. 



