Monographs Details: Baccharis brachylaenoides var. ligustrina (DC.) Maguire & Wurdack
Authority: Maguire, Bassett & Wurdack, John J. 1957. The Botany of the Guiana Highland -- Part II. Mem. New York Bot. Gard. 9 (3): 235-392.
Family:Asteraceae
Discussion:

B. ligustrina DC. Prodr. 5: 421. 1836.

B. vitis-idaea Oliver. Trans. Linn. Soc. Bot. II, 2: 277. 1887.

B. roraimae Schomb. Fauna & Fl. Guy. 1078. 1848. Nomen nudum.

B. ptariensis Steyermark, Fieldiana Bot. 28: 624. 1953.

DeCandolle described simultaneously B. brachylaenoides, B. venulosa, and B. ligustrina. Baker (in Mart. Fl. Bras. 63 I: 82. 1884) synonomized B. venulosa under B. brachylaenoides, although he apparently did not see the Haenke specimen upon which B. venulosa was based; the photograph of the type material (F8178) indicates that Baker was correct, as do subsequent Peruvian collections (Killip & Smith 25704, Spruce 4333). Subsequent authors of varieties of B. venulosa (Hieronymus, Cuatrecases, Steyermark) without explanation did not follow Baker's interpretation; isotypes of B. venulosa var. cuspidibracteata Steyermark and B. venulosa var. oblanceolata Hieron. have been examined by us and are certainly conspecific with B. brachylaenoides; whether they are sufficiently distinct to be varieties is not germane to the present discussion. Typical var. brachylaenoides has large broadly oblanceolate acute to shortly acuminate leaves and a well-developed large panicle. Typical var. ligustrina has small, narrowly to broadly oblanceolate obtuse, apiculate, often 1-3-mucronulate leaves, smaller stature, less well developed panicles, and fewer flowers per head (10-15 rather than 12-25). Many geographically uncoordinated intermediates exist; even the more typical specimens show little geographical correlation. Typical var. bracbylaenoides is represented by Riddel 575, Glaziou 11047, 6610, Gardner 490, 778, all from southeastern Brazil; Schomburgk 1014, Maguire & Maguire 35084, 35179, 35359, 35447 from Venezuela; and the previously mentioned Peruvian collections. Collections with varying degrees of intermediacy toward var. ligustrina are: Gardner 4915, Miers 3624, Glaziou 11111, 11114, from southeastern Brazil; Rusby 1490, Williams 1454, Bucbtien 258r Rusby 1579 from Bolivia; and Pbelps & Hitchcock 446, Cardona 1976 from Venezuela. More or less typical var. ligustrina is represented by: Riedel HI/73 and Glaziou 15088 from southeastern Brazil; Tate 285 from Bolivia; Steyermark 58725, 59928, 60123. Steyermark & Wurdack 337, 338, 339, 340, 773, Phelps & Hitchcock 398, Maguire & Maguire 40439, Steyermark 74892, 75872, Maguire, Wurdack, & Bunting 37114, 37297, 37313, Pinkus 110, Steyermark 58796, Ouelch & McConnell 91, and Tate 399, all from southern Venezuela and adjoining Brazil. The quantitative characters used to distinguish B. ptariensis from B. vitis-idaea have no significance; the degree of inflorescence-development varies greatly within the series Steyermark & Wurdack 337-340, all collected within a very small area on Chimanta- tepul. It is believed that the robust plants of var. brachylaenoides represent a response to a sheltered environment as contrasted to the usually open areas in which the diminutive plants of var. ligustrina grow, at least in the Pacaraima cumbres. This study has been supplemented by a generous loan of the Kew material of the taxa concerned.