Xerodraba patagonica (Speg.) Skottsb. subsp. patagonica

Salariato, Diego L., Zuloaga, Fernando O. & Al-Shehbaz, Ihsan A., 2015, A taxonomic revision of the genus Xerodraba (Eudemeae, Brassicaceae), Phytotaxa 207 (1), pp. 39-67 : 61-64

5.1 Xerodraba patagonica (Speg.) Skottsb. subsp. patagonica

Branches 2−5 cm tall; caudex to 1 cm in diam. Leaves (1.7−)2.3−3.0(−4.0) × 1−1.6 mm. Sepals oblong, (3.4−)4.1−4.6(−5.2) × 1.4−1.8 mm; petals (6.7−)7.5−8.4(−10.8) × 1−1.7 mm; filaments 4−5 mm long, not expanded at base; anthers oblong, (0.8−)1.0−1.1(−1.5) mm long. Fig. 18 .

Distribution and habitat:— Xerodraba patagonica subsp. patagonica grows in southern Argentina (Chubut and Santa Cruz) and Chile (Magallanes and Antartica Chilena) at 50−1050 m ( Fig. 13F ).

Specimens examined:— ARGENTINA. Chubut: Dpto. Escalante, Pampa del Castillo , 13 October 1929, Donat 181 (BM, CAS, F, GH, K, MO, S, SI, UC, Z) ; Donat 182 ( BAA) ; Pampa del Castillo , 16 November 1975, CNP 734 ( BAA, BAB) ; Rada Tilly , golfo San Jorge, without collector (LPS- 21541 in LP) ; Ruta Provincial 27 hacia Río Chico a unos 10 km del cruce con la Ruta Nacional 3, 28 October 2005, Cocucci et al. 3587 ( SI). Santa Cruz: Dpto. Deseado, Barda Las lajas, Palau Mt. , Comber 260 (E, K) ; Dpto. Güer Aike, 500 m de Ruta Nacional 3, entrada a Yacimiento Estancia La Maggie , 26 November 2012, Zuloaga et al. 14104 ( SI) ; Estancia las Vizcachas, ca. 2 km O de laguna Las Vizcachas , 23 January 1977, TBPA 2372 ( BAA, HIP) ; Estancia Le Marchand sobre Ruta Nacional 3, 6 November 2005, Cocucci et al. 3703 ( SI), Güer Aike, sobre Ruta Nacional 5 a Calafate, unos 3 km de Güer Aike, 5 November 2005, Cocucci et al. 3701 ( SI) ; Hotel Esperanza , 16 March 1914, Iter Patagonicum 360 ( SI) ; orillas del Río Coyle, Bardas Blancas , 30 September 1950, Sleumer 919 ( CONC, US) ; por Ruta 7, a 2.5 km del cruce con Ruta Nacional 5, en dirección a Estancia Camasu Aike , 1 February 1995, Fortunato & Elechosa 4919 ( BAB) ; Río Gallegos, Cerro Tres Hermanos , 2 December 1950, Sleumer 930 ( CONC, US) ; Ruta Nacional 40, 15 km N de la Esperanza hacia Lago Argentino , 27 November 1963, Correa 2868 ( BAA) ; Dpto. Lago Argentino, Cerro El Calafate , en la cumbre, 20 December 1950, Sleumer 1201b ( BAA) ; Cerro Huiliches, Laberinto 2, Olla Chingue , 15 December 2001, Guerrido & Fernández 446a ( SI) ; Cerro Huiliches , 23 November 2012, Zuloaga et al. 14035 ( SI) ; Zuloaga et al. 14043 ( SI) ; Cerro Huiliches , 19 November 2013, Zuloaga et al. 14734 ( SI) ; Lago Argentino, Boulders Cerro Calafate , 25 November 2007, Guerrido et al. 729 ( SI) ; El Calafate, Cerro Frías , 19 November 2013, Zuloaga et al. 14743 ( SI) ; Dpto. Lago Buenos Aires, Patagonia prope Lago Buenos Aires , 15 December 1902, Koslowsky s.n. ( BAA) ; Dpto. Río Chico, La Bajada , 1 March 1914, Iter Patagonicum 377 ( SI). CHILE. XII Magallanes and Antartica Chilena : Prov. Magallanes, Punta Arenas, Península de Brunswick, Reserva Forestal Laguna el Parrillar al norte, 18 February 1993, Henríquez & Pisano 136 ( CONC, HIP) ; Península de Brunswick, Laguna el Parrillar al norte, 14 January 1982, Dollenz 947 ( HIP) ; Cumbre del cerro próximo al monte Fen , 19 February 2003, Domínguez 1 ( CONC) .

5.2 Xerodraba patagonica (Speg.) Skottsb. subsp. pycnophylloides (Speg.) Salariato & Al-Shehbaz comb. nov. Braya pycnophylloides Spegazzini (1899: 172) . Eudema pycnophylloides (Speg.) Gilg & Muschler (1909: 471) . Xerodraba pycnophylloides (Speg.) Skottsberg (1916: 362) . Type:— ARGENTINA. [Provincia de Santa Cruz]. Dpto. Lago Argentino, Lago Argentino, hab in montains Karr-aik, prope Lago Argentino, March 1898, C. Ameghino s.n. (holotype LPS-19006! in LP, isotypes, B!, BAA!, UPS!).

Eudema microphylla Gilg & Muschler (1909: 472) . Xerodraba microphylla (Gilg & Muschl.) Skottsberg (1916: 362) . Xerodraba pycnophylloides var. microphylla (Gilg & Muschl.) Schulz (1924: 250) . Type:— ARGENTINA. [Provincia de Santa Cruz] Dpto. Güer Aike, Patagonia Austral, Río Gallegos, O. Nordensjöld A-56 (holotype B!; isotypes BAA! fragm. ex B!).

Branches 1−3 cm tall; caudex to 2 cm in diam. Leaves (1.6−)2.0−2.2(−3.1) × 0.6−1 mm. Sepals oblong, (2.5−)3.0−3.2(−4.1) × 0.9−1.5 mm; petals (4−)4.3−5.8(−6.9) × 1−1.5 mm, apex; filaments 2−3.5 mm long, not expanded at base; anthers oblong, (0.7−)0.85−0.95(−1.0) mm long. Fig. 19 .

Distribution and habitat:— Xerodraba patagonica subsp. pycnophylloides is endemic to Argentine Patagonia (Chubut and Santa Cruz) and grows at 20−850 m ( Fig. 13F ).

Taxonomic notes:— Results of the morphological analyses show that Xerodraba patagonica and X. pycnophylloides can be separated only by quantitative characters, mainly sepal and petal lengths, and hence they are recognized as subspecies (see Results and Discussion). Finally, Boelcke’s (1984) consideration of fruit length as useful in the separation of the two taxa is dismissed based on our numerical analyses because it was strongly overlapped between them.

The specimen H.F. Comber 335 (E, K) was collected in Cerro Bayo, Argentina but the province is not consigned. There are mountains in Argentine Patagonia called “Cerro Bayo”. One of them is located in Dept. Lago Buenos Aires in Santa Cruz Province and overlap with the distribution of the species. The other locality is in Neuquén province, far north of the distribution range of the species. Since it is not possible to precisely define the origin of this specimen, we decided to exclude it from X. pycnophylloides distribution.

Specimens examined:— ARGENTINA. Province not consigned: Cerro Bayo, 25 February 1925, Comber 335 (E, K). Chubut: Dpto. Escalante , Pampa del Castillo , 2 February 1932, Castellanos s.n. ( SI-167213 , BA-6011). Santa Cruz: without locality, Burmeister 169 ( BAB, SI) ; Dpto. Corpen Aike , Ruta Nacional 3, Parque Nac. Monte León, 26 November 2012, Zuloaga et al. 14111 ( SI) ; Dpto. Güer Aike , Estancia Güer Aike, 28 November 1950, Sleumer 891a ( BAA, G, US) ; Río Gallegos , Kalela 1888 (H) ; 1897, Nordenskjöld s.n. ( UPS) ; 10 December 1975, TBPA 397 ( HIP, SI) ; Río Gallegos , Estancia Los Pozos, 5 December 1975, TBPA 129 ( BAA) ; Río Gallegos , laguna La Leona, 7 December 1975, TBPA 266a ( BAA, BAB, SI) ; Dpto. Lago Argentino, Camino de Mata Amarilla a Estancia Australasia, 10 km al sur de la Estancia Bajada de la Oriental, 16 March 1977, León 2189 ( BAA) .

Figures

FIGURE 13. Distribution of Xerodraba species. A. map of South America showing the studied area. B, Xerodraba distribution. C, X. colobanthoides. D, X. glebaria. E. X. lycopodyoides. F, X patagonica, cicles = subsp. patagonica, squares = subsp. pycnophylloides.

FIGURE 18. Xerodraba patagonica subsp. patagonica. A, plant. B, leaf. C, flower. D, sepal. E, petal. F, detail of nectaries, lateral view. G, diagram of nectaries in cross-section view. H, fruit. I, fruit in longitudinal section showing the seeds and septum. From Arroyo 318, BAA. Scale bars: A = 1 cm; B, D, E, F, H, I =1 mm, C = 5 mm.

FIGURE 19. Xerodraba patagonica (Speg.) Skottsb.subsp. pycnophylloides (Speg.) Salariato & Al-Shehbaz. A, plant. B, leaf. C, flower. D, sepal. E, petal. From TBPA 266a, BAB. Scale bars:A = 1 cm; B, C, D, E =1 mm.