Monographs Details: Stegolepis choripetala Maguire
Authority: Maguire, Bassett. 1965. The Botany of the Guayana Highland. Mem. New York Bot. Gard. 12 (3): 1-285.
Family:Rapateaceae
Description:Latin Diagnosis - Herbae perennes terrestres 2-3 m altae; caudicibus erassis carnosis 0.5-3.0 dm longis; foliis 5-9 distichis; vaginis conduplicatis equitantibus, in uno piano dispositis, 20-30 cm longis, 5-6 cm latis, coriaceis, eligulatis, scarioso-marginatis, basim marginis plus minusve 1 cm latis, non-evidentur nervatis; laminis 7-25 dm longis, 3.5-5.0 cm latis, subtiliter 80-100-nervatis, apice falcato subacute, costa prominenta; pedunculis axillaribus 5-7 per lamina, ferme 8-12(-18) d m longis, 2-3 mm erassis, in sieco sulcatis, sursum compresso-dilatis 3-4 mm latis; capitulis compressis, 15-18 (-30)-floribus, 2-3-seriatis; spieulis ca. 15 mm longis, sepalis inclusis; bracteolis 12-14-gradatis, exterioribus 2 m m longis, 3 m m latis, orbieulari-obovatis, obtusis, leviter 3-nervatis, apice subcucullato, interioribus late elliptico-lanceolatis, 5.0-6.5 mm longis, obtusis, leviter 5-nervatis; sepalis liberis oblongo-lanceolatis, subacutis, naviculoideis 9-10(-12) mm longis, leviter 7-9- nervatis, basi 2-3 mm membranacea; petalis 8-10 mm longis, unguibus 4—5 mm longis, 2.5-3.0 mm latis, carnosis, papillosis; laminis 4-5 mm longis, lanceolatis, ca. 3 mm latis, delicatis, aeutis minute auriculatis, margine minute crispo; filamentis liberis 4-5 mm longis, uninervis ca. 1.5 mm latis, antheris ca. 5 mm longis sursum angustatis, 4-locularibus, ad basim brevi-auriculatis, poro minuto oblique apicale; ovario 3-loculare, loculis pluriovulatis; stylo trigono acuto; capsulis obovatis ca. 6 mm longis, ad basim membranaceis, sursum induratis, endocarpo crasso, separate ex exocarpo; seminibus 7-8 per loculo, ca. 1 mm diam, valde adpressis angulatis, testa laxa, membranacea pallida.

Distribution and Ecology - Distribution. Known only from the summit of Cerro Sipapo, Amazonas, Venezuela, but there of wide distribution.

Discussion:Stegolepis choripetala is quite common on the summit of Cerro Sipapo, sometimes occurring densely about the edge of the cumbre. In higher thickets the plants attain the considerable height of 3 meters. This Sipapo species is most closely related to S. parvipetala Steyerm., known only from Ptari-tepui in the eastern Gran Sabana region, in which the corolla is connate into a tube, and the flowers and heads considerably larger. S. choripetala further seems to be the connecting link with the segregate genus Epidryos because of separable endocarp and small anthers that dehisce by a rounded obliquely apical pore.