Hierochloe juncifolia (Hackel, 1911) Parodi, 1938

Lema-Suárez, Irene, Sahuquillo, Elvira & Pimentel, Manuel, 2021, A revision of Hierochloe sect. Monoecia (Anthoxanthinae, Pooideae, Poaceae), Phytotaxa 478 (1), pp. 92-104 : 96-97

2. Hierochloe juncifolia (Hackel in Stuckert (1911: 64)) Parodi (1938: 27).

Basionym: Hierochloe utriculata var. juncifolia Hackel in Stuckert (1911: 64). Type: ARGENTINA. Chubut, Dpto. Laguiñeo, Region del Rio Corcovado , 20-25 March 1901, N. Illin 222 (lectotype here designated:

BAA-00002189 digital image!; isolectotypes: BAA-00002188 digital image!, US-00132617 digital image!, CORD n.v., LP n.v., W

n.v.). Homotypic names: Anthoxanthum juncifolium (Hackel) Veldkamp in Schouten & Veldkamp (1985: 348).

Description: Stems 30–80 cm. Leaf-sheaths longer than the internodes, glabrous or scabrid. Ligule ciliate. Leaf-blade 7–35(37) cm × (1) 2–6 mm, filiform, convolute, stiff, striate, pubescent and scabrous adaxially and glabrous abaxially. Leaf apex pungent. Panicle 6–11(15) × (0.6) 1–1.5 cm, spiciform, linear. Rhachis and pedicels short and scabrous. Spikelets 6–7 mm, ovate. Glumes 5–7 mm, ovate, 3-nerved, equal or shorter than the spikelet. Lemmas of male florets 5–6.5 mm, papyraceous, ciliolate on the margins. Lemma of lower male floret mucronate, 1-keeled, 5-veined, muticous. Lemma of upper male floret awned, awn dorsally inserted, shorter than 4 mm. Lemma of apical female floret 4–4.5 mm, ovate, membranaceous, unkeeled, 5-veined, glabrous, scaberulous or scabrous in the upper third.

Leaf anatomy: Long cells, 77–96 μm. Short cells S2. Stomata in adaxial surface. High density of hooks in the epidermis and clear bulliform cells. Leaf section closed with 12–25 polygonal ribs. Median vascular bundle sheath single (not complete), midrib not clearly differentiated. Subepidermal sclerenchyma continuous ( Figure 1. B & F ).

Genome size and inferred DNA-ploidy levels: 2C = 13.86–14.98 pg, 4 x.

Habitat: Volcanic, stony or sandy soils in mountain slopes, 0–1750 m a.s.l. ( De Paula 1975, Connor & Renvoize 2009, Sede 2012).

Distribution: Discontinuously distributed throughout Central-South Chile and Argentina ( De Paula 1975, Sede 2012). Also recorded in the Central Andes of Peru ( Connor & Renvoize 2009, Sede 2012).

Phenology: November–March.

Specimens examined: ARGENTINA. Río Negro Province: San Carlos de Bariloche , dry bank, tufted, S 41º 09’ W 71º 19’, 13 November 1948, H.A. Senn s.n. (US-2117914) . Chubut: Region Rio Corcovado (SI-001850) . CHILE.

Aysen Region: Capitan Prat: Cochrane, 2007 (CONC-172568). Capitan Prat, 2006 (CONC-166409). Capitan Prat, 2006 (CONC-172569). Araucania Region: Curacautin : near Conguillio N.P., volcanic soil, 1098 m, S 38º 37.623’ W 071º 44.214’, 12 January 2014, E. Sahuquillo & M. Pimentel s.n. (SANT-73531). PERU. Department of Ancash: Yungay Prov.: Llanganuco Valley (high Andes), 3962–4877 m, on moraines, S 9º W 77º 30’, August 1959, J.C. Torhill s.n. (US-2882401) .

Observations: Parodi (1938) proposed the new combination based on Hackel’s variety, by provided no typification. Subsequently, Parodi (1941) used the duplicated material of the collection N. Illin (nº 222) that exists at the Darwinion Institute Herbarium (SI) to describe this species since, as he writes, “ no he visto el tipo ”. There are other specimens from the same collection (Illin 222) in different herbaria that are syntypes (Article 7.11, Ex. 13 in Turland et al., 2018). Schouten & Veldkamp (1985), Sede (2012) and Villalobos et al. (2019) indicate that the holotype may be in W, but none of them was able to see the plant. The specimen could not be found in W in 2020 under any of its names when we contacted with the Curator of Vascular Plants, Dr Christian Bräuchler (personal communication). We here designate the specimen from SI as the lectotype following Article 9.12, Ex. 12 in Turland et al. (2018).

Figures

FIGURE 1. Hierochloe sect. Monoecia micromorphology details.A–C. Leaf transverse section. A. H. pusilla, leaf transverse section open with round ribs. B. H. juncifolia, leaf transverse section closed with polygonal ribs. C. H. redolens var. altissima, leaf transverse section open with quadrangular ribs. D–F. Leaf epidermis. D. H. redolens var. gunckelii, adaxial epidermis with long cells type I3 and stomata. E. H. pusilla, leaf epidermis with long cells type I3 and short cells S5 (round). F. H. juncifolia, leaf epidermis with long cells type I3 and short cells S2 (ax shaped).