Vantanea spiritu-sancti (Cuatrec.) K.Wurdack & C.E.Zartman, 2019

Wurdack, Kenneth J. & Zartman, Charles E., 2019, Insights on the systematics and morphology of Humiriaceae (Malpighiales): androecial and extrafloral nectary variation, two new combinations, and a new Sacoglottis from Guyana, PhytoKeys 124, pp. 87-121 : 97

Vantanea spiritu-sancti (Cuatrec.) K.Wurdack & C.E.Zartman comb. nov.

Humiriastrum spiritu-sancti Cuatrec., Ciencia, Mexico 23(4): 137. 1964. Type: BRAZIL. Espírito Santo, Mun. de Santa Tereza: Lombardia, 25 Jan 1954, G. Dalcolmo s.n. (holotype: RB-86212; isotype: US-2827596).

Notes.

Humiriastrum spiritu-sancti was poorly known until recent ample collections allowed a fuller characterization. Giordano and Bove (2008) described its thecae as unilocular, ovary cells as uniovulate, and fruits as having five apical foramina. The transfer here to Vantanea is supported by anther structure that we interpret as two lateral bisporangiate thecae with internal septa (Fig. 3D ; see Results), two superposed ovules per locule (Fig. 3F ), apparent lack of foramina, as well as previously reported pollen details (Bove and Melham 2000), and preliminary molecular phylogenetic placement (Zartman et al., unpublished data). Upon examination of endocarps from Amorim et al. 1391 (US-3258470, as sectioned for Herrera et al. 2010), as well as the illustration from Giordano and Bove (2008), we could not find well-developed apical foramina that otherwise characterize Humiriastrum . Furthermore, the androecial bauplan of V. spiritu-sancti with a low number of alternating-length stamens is similar to that of V. depleta .

Figures

Figure 3. Stamen structure and anatomy of Humiriaceae. A Vantanea compacta anther, lateral B Vantanea compacta anther, dorsal C Vantanea depleta anther, lateral D Vantanea spiritu-sancti anther, lateral E Schistostemon oblongifolius clearing of androecium with 3 stamen types, ventral F Vantanea spiritu-sancti longitudinal section of ovary with 2 superposed ovules per locule; lower left ovule partial G Hylocarpa heterocarpa anthers (left to right): disporangiate dorsal, ventral; sterile, dorsal. Sources: A, B Hatschbach 21265 C Hammel & Trainer 12954 D, F Silva et al. 1436 E Maas et al. 6804 G Ducke [JBRJ- 30137] (all US).