Habenaria lavrensis var. xanthodactyla J. A. N. Bat. & Bianch. 2023, var. nov.
Creators: name: Batista, João A. N.
name: Cruz-Lustre, Gabriela
name: do Vale, Aline A.
name: Bianchetti, Luciano B.
Publisher: name: Zenodo
Year: 2023
Subjects: Biodiversity
Taxonomy
Plantae
Tracheophyta
Liliopsida
Asparagales
Orchidaceae
Habenaria
Habenaria lavrensis
Habenaria lavrensis hoehne var. xanthodactyla j.a.n.bat. &amp; bianch.

description: Habenaria lavrensis Hoehne var. xanthodactyla J.A.N.Bat. & Bianch. var. nov.
urn:lsid:ipni.org:names:77326615-1
Figs 3G–H
Diagnosis
Similar to H.lavrensis var. lavrensis in general morphology, habitat and phenology, but distinguished by the yellow segments of the petals and lip (vs white) and by the geographical distribution restricted to the Chapada dos Veadeiros region (vs broadly distributed in the States of Goiás, Minas Gerais, and Distrito Federal).
Etymology
From the Greek ‘xanthos’ (yellow) and ‘dactylos’ (finger), referring to the yellow segments of the petals and lip.
Material examined
Type BRAZIL – Goiás • São João da Aliança. GO-118, cerca de 22 km S de São João da Aliança; 9 Feb. 2004; fl.; J.A.N. Batista & K. Proite 1494; holotype: BHCB [BHCB199457]; isotypes: CEN, RB, SP.
Paratypes
BRAZIL – Goiás • Alto Paraíso de Goiás, Chapada dos Veadeiros; 27 Jan. 1993; fl.; J.A.N. Batista & L.B. Bianchetti 386; CEN [CEN00018264] • Alto Paraíso de Goiás, Chapada dos Veadeiros, na estrada de terra em direção a cachoeira da Água Fria; 8 Jan. 2003; fl.; J.A.N. Batista et al. 1365; CEN [CEN00046058] • Alto Paraíso, Chapada dos Veadeiros, em direção ao Vale da Lua, cerca de 1, 7 km do entroncamento com a GO-239; 30 Dec. 2010; fl.; J.A.N. Batista & L.B. Bianchetti 3095; BHCB [151368] • Alto Paraíso de Goiás, Chapada dos Veadeiros; 30 Dec. 2010; fl.; J.A.N. Batista & L.B. Bianchetti 3100; BHCB [151373] • Chapada dos Veadeiros, 5 km E of Alto Paraíso; 1500 m; 24 Jan. 1979; fl.; Gates & Estabrook 12; HB [70548], NY [NY01031853], RB [RB00257176], SP [195098], UB [UB0018813] • Alto Paraíso de Goiás, Parque Nacional da Chapada dos Veadeiros, trilha para as corredeiras; 23 Jan. 2009; fl.; P.L. Ribeiro et al. 396; HUEFS [HUEFS0162888] • Alto Paraíso de Goiás, estrada para a Vila de São Jorge; 23 Jan. 2005; J. Paula-Souza 4555; ESA [090150] • Alto Paraíso de Goiás, Parque Nacional da Chapada dos Veadeiros, trilha para as Cachoeiras; 24 Jan. 2005; J. Paula-Souza 4581; ESA [090176] • São João da Aliança, 21 km ao Sul de São João da Aliança; 23 Feb. 1997; fl.; J.A.N. Batista et al. 729; CEN [CEN00026177] • ca 20, 5 km S de São João da Aliança; 5 Feb. 2010; J.A.N. Batista et al. 2965; BHCB [137850].
Distribution, Habitat and Phenology
Habenaria lavrensis var. xanthodactyla var. nov. is so far only known from Chapada dos Veadeiros, Goiás, in the municipalities of Alto Paraíso de Goiás and São João da Aliança. In the northern part of Chapada dos Veadeiros, in the Distrito Federal and the state of Minas Gerais, where we have collected or examined specimens of this species, only H.lavrensis var. lavrensis is known. Habenaria lavrensis var. xanthodactyla var. nov. grows in dry, hillside or campo rupestre, in shallow, dry, gravelly soil. Flowering occurs during the peak of the rainy season, from January to February. In common with other grassland species of the genus, bushfires favoured flowering during the dry period. All populations we observed in flowering grew in areas that burned in the previous dry period. The habitat and the flowering period are about the same between the two varieties.
Conservation Assessment
Habenaria lavrensis var. xanthodactyla var. nov. is currently known from only seven populations from six localities and shows an EOO estimated at 1,647 km 2 and an AOO of 32 km 2. Based on the IUCN Red List Categories and Criteria and its guidelines (IUCN 2012, 2016), the species can be tentatively classified as Vulnerable VU B1ab(iii)+2ab(iii).
Taxonomic notes
Habenaria lavrensis var. xanthodactyla var. nov. is identical in vegetative and flower morphology to H.lavrensis var. lavrensis but distinct by the yellow lateral segments of petals and lip (Fig. 3G–H). In contrast, the entire flower is completely white or, at most segments, slightly creamy-white in H. lavrensis var. lavrensis (Fig. 3F). Both H.lavrensis var. lavrensis and H.lavrensis var. xanthodactyla var. nov. grow at the Chapada dos Veadeiros as homogeneous populations, spatially separated, and we have never found mixed populations or intermediate specimens. In defining the taxonomic rank of this taxon, we followed Stace (1989), who defined a variety as "a population of one or several biotypes, forming more or less distinct local races of a species."
description: Published as part of Batista, João A. N., Cruz-Lustre, Gabriela, do Vale, Aline A. & Bianchetti, Luciano B., 2023, Checklist and molecular phylogenetics reveal three taxonomic novelties in Habenaria (Orchidaceae, Orchidoideae) from Chapada dos Veadeiros, Goiás, Brazil, pp. 51-86 in European Journal of Taxonomy 891 on pages 64-65, DOI: 10.5852/ejt.2023.891.2271, http://zenodo.org/record/8368306