Monographs Details: Chimarrhis bathysoides Steyerm.
Authority: Maguire, Bassett. 1965. The Botany of the Guayana Highland. Mem. New York Bot. Gard. 12 (3): 1-285.
Description:Latin Diagnosis - Arbor 7-metralis, stipulis caducis terminalibus lanceolato-oblongis 12-13 mm longis extus dense strigosis; foliis petiolatis, petiolis 6-13 mm longis glabris; laminis elliptieo-obovatis apice abrupte acuminatis basi aeutis vel subobtusis, 14-21.5 cm longis 8-15 cm latis utrinque glabris, subtus in axillis nervorum minute barbellatis, nervis tertiariis prominentibus; nervis lateralibus utroque latere 7-8; inflorescentia paniculato-cymosa 22 cm longa 25 cm lata 5 cm longe pedunculata divaricate ramosa, ramis dense puberulenti-tomentosis densifloris; floribus sessilibus vel subsessilibus 2- vel 3-f asciculatis per axes ultimas insidentibus; calyce hypanthioque subcylindrico 3 mm longo, hypanthio 2 mm longo extus minute adpresso-puberulenti; calyce extus puberulenti, tubo ca. 0.7-0.8 mm longo usque ad hypanthium manifeste constricto 5-lobato, lobis brevibus late rotundatis 0.2 mm altis 0.5 m m latis; corolla subcylindrica 2.5 mm longa, tubo 1.6-1.8 mm longo 0.8-0.9 m m lato vel fauce 1.2-1.5 mm lato, extus glabro intus fauce dense villoso ceterum glabro, lobis suborbieularibus vel late rhomboideo-oblongis obtusis vel rotundatis 0.7-1 mm longis 0.7-0.8 mm latis utrinque glabris; antheris late oblongis 0.5 mm longis; filamentis 2 mm longis exsertis glabris basi dense villosa excepta; stylo clavato exserto 3 mm longo glabro, stigmatibus oblongis apice rotundatis 1 m m longis.

Discussion:The holotype is in full anthesis. A n examination of the youngest flowers which have not expanded shows the aestivation too far advanced to judge whether the corolla-lobes are valvate. However, a careful microscopic dissection reveals the youngest flowers (before the stamens have become exserted) with the corollalobes separated but apparently of valvate origin. For this reason, the species is placed in the genus Chim.arrhis. Although the leaves and inflorescence habit resemble the genus Bathysa, that genus generally has persistent interpetiolar stipules remaining attached below the apex, imbricate corolla-lobes, usually pubescent style, and usually subalate seeds. The newly described C. bathysoides also resembles Sickingia, but that genus has imbricate aestivation of the corolla-lobes, loculicidally dehiscent larger capsules with winged seeds, and usually caducous stipules. Among the species of the genus Chimarrhis, the new species is outstanding in the very short corolla-lobe with respect to the length of the corolla-tube (in this respect resembling Parachimarrhis breviloba Ducke), in the very broad, loosely branched inflorescence, and in the conspicuously transverse tertiary venation connecting the lateral nerves. From Parachimarrhis breviloba, it may be separated by the septicidal dehiscence of the capsule, prominently pubescent, persistent terminal stipules, larger leaf-blades, larger inflorescences on longer peduncles, larger calyx with rounded lobes, smaller corolla, and smaller seeds. From Chimarrhis turbinata it differs in the glabrous style and disk, smaller and narrower corollas, and more lobate calyx.