Monographs Details: Irlbachia nemorosa (Willd. ex Roem. & Schult.) Merr.
Authority: Maguire, Bassett. 1978. The botany of the Guayana Highland--part XI. Mem. New York Bot. Gard. 32: 1-391.
Description:Distribution and Ecology - Distribution. Savannas and open places, Rio Negro, Brazil, Alto Orinoco, Venezuela. BRAZIL. Amazonas: Prope Panure ad Rio Uaupes, 1852-1853, Spruce 2524 (holotype of Lisianthus recurvus Bentham, K, isotype NY). VENEZUELA. Territorio Amazonas: annual herb, flowers lavender, frequent along moist woodland trail, Danta Falls, Rio Cuao, Rio Orinoco, 19 Nov 1948, Maguire & Politi 27324A (NY); flowers white with purple anthers, on mossy bank, occasional along Rio Cunucunuma for 0.5 mi above Culebra Rapids, 200 m alt, 24 Dec 1950, Maguire, Cowan & Wurdack 30402 (NY); herb to 0.2 m, flowers white, frequent in forest clearing, savanna edge, 1 km east of Maroa, Río Guainia, 130 m elev, 25 Nov 1953, Maguire, Wurdack & Bunting 36396 (NY); flowers white, frequent, Yavita-Pimichin trail near Yavita, 125-140 m elev, Rio Atabapo, 10 Jun 1959, Wurdack & Adderley 42926 (NY). Estado Bolivar: epiphytic herb, leaves fleshy-membranous, corolla pale hlac-white, segments spreading-rotate, junction of Río Abacapa and Río Apacara, 415 m alt, Chimanta Massif, 29 Mar 1953, Steyermark 74683 (NY, VEN, F).

Discussion:4. Irlbachia nemorosa (WiUd.) Merrill, Proc. Am. Phil. Soc. 86: 88. 1943. Fig 81 A - D, 84 M - W. Claytonia nemorosa (Willd.) ex Roem. & Schult. Syst. Veg. 5: 436. 1819. Ditomaga nemorosa Raf., Act. Soc. Linn. Bordeaux 6: 267. 1834. Irlbachia bonplandiana Fenzel, Nov. Stirp. Dec 12, 1839. Lisianthus recurvus Bentham, Jour. Bot. Kew Misc. 6: 201. 1854. Type. Prope Panure ad Rio Uaupes, Oct 1852-Jan 1853. R. Spruce 2424 (holotype K, isotype NY). Irlbachia recurva (Bentham) Progel, Mart. Fl. Bras. 6(1): 229. 1865. Type. Crescit in umbrosis prope Javitam Orinocensum, Bonpland 957, mss (P?). E. D. Merrill (1943), among a series of nomenclatural clarifications, perhaps recognizing that the generic name Claytonia would be misapphed when assigned to low altitude Rio Negro Basin plants, detailed the applicable synonymy and proposed correctly the binomial, Irlbachia nemorosa, for the modest annual gentian in question. He points out that all binomials of the pre-Bentham series were based on a single collection (Bonpland 957). I have not seen the HBK specimen, but Bonpland's footnote characterization (1823) coincides with that of the population of the species in the type region. We have in New York ample topotypic specimens. Further, there is in New York also an isotype of Irlbachia recurva. Spruce 2524.
Distribution:Brazil South America| Venezuela South America|