Hierochloe redolens var. utriculata ( Ruiz & Pavón 1798: 251 ) Lema, Sahuquillo & Pimentel 2021

Lema-Suárez, Irene, Sahuquillo, Elvira & Pimentel, Manuel, 2021, A revision of Hierochloe sect. Monoecia (Anthoxanthinae, Pooideae, Poaceae), Phytotaxa 478 (1), pp. 92-104 : 100

4.4. Hierochloe redolens var. utriculata ( Ruiz & Pavón 1798: 251) Lema, Sahuquillo & Pimentel comb. nov.

Basionym: Torresia utriculata Ruiz & Pavón (1798: 251) .

Type: CHILE. Biobio Region, Concepcion Province , “habitat in inundatis campis Conceptionis Chile, versus Biobio et Andalien flumina”, H. Ruiz & J.A. Pavón s.n. (Lectotype here designated: MA-810185 digital image!; isolectotypes: P-01931093 digital image!, P- 01931094 digital image!, BAA n.v.) .

Homotypic synonyms: Hierochloe utriculata (Ruiz & Pavón) Kunth in Humboldt & Bonpland (1829: 139), Anthoxanthum utriculatum (Ruiz & Pavón) Veldkamp in Schouten & Veldkamp (1985: 350), Anthoxanthum utriculatum var. utriculatum (Steudel) N. Villalobos & Finot (2019: 130) .

Description: Robust grass, 100–200 cm. Culms with 3–5 brown and glabrous nodes. Ligules obtuse. Leaf-blades 20–60 cm × (5)8–9(14) mm, convolute, glabrous or scaberulous adaxially and scabrous abaxially. Panicle 9–26 × 0.9–3.3 cm, spiciform, dense, linear, interrupted at the base and narrowing towards the apex. Lower branches of the inflorescence adpressed. Rhachis and branches scabrous and short. Spikelets 5–7 mm, oblong. Glumes ovate, 3- veined. Midvein scabrous and lateral veins interrupted in the middle. Lower glume 4–7 mm, shorter than or equal to the florets. Upper glume 4.5–7 mm. Lemma of male florets 5–7 mm, membranaceous, scabrous. Awn 0.5–1.5 mm and apically inserted. Lemma of lower male floret elliptic, 1-keeled, 5-veined. Lemma of upper male floret oblong. Lemma of apical female floret 4 mm, muticous or mucronate.

Leaf anatomy: Long cells 190–240 μm long. Stomata 36–42 μm, in adaxial surface. Bulliform cells present. Leaf section closed with 28–30 quadrangular ribs.

Habitat: Sandy soils in coastal areas and riverbanks, 0–1450 m a.s.l. ( De Paula 1975, Sede 2012).

Distribution: Central Chile (from Biobio to Los Rios) and Argentina (Neuquen) ( De Paula 1975, Sede 2012).

Genome size and DNA-ploidy levels: 2C = 16.89–19.34 pg, 6 x.

Phenology: November–January.

Specimens examined:— CHILE. Biobio Region: Arauco: Lake Lanalhue, road from Contulmo to Cañete , in the reed bed, 4 m, S 37º 54.453’ W 073º 17.147’, 11 January 2014, E. Sahuquillo & M. Pimentel s.n. (SANT-73536); Concepcion: Hualpen: Cala Lenga, marsh border, 8 m, S 36º 46’ 03.02’’ W 73º 09’ 28.62’’, 9 January 2014, E. Sahuquillo & M. Pimentel s.n. (SANT-73537) .

Observations: No reference to any particular specimen is included in the protologue of Torresia utriculata , where only the region of collection is mentioned. One specimen collected by Ruiz & Pavón is stored in the Real Jardín Botánico de Madrid Herbarium (MA), but no locality is included in the label. Parodi (1941) highlighted this specimen as the “type”, but no correct typification was carried out [Article 9.10 in Turland et al. (2018)]. Plants conserved in the Dombey and Jussieu Herbaria at the Muséum National d’Histoire Naturelle de Paris (P, sub Torresia utriculata , P-31093, P-01931094 and P-00661399, the latter with a label that reads “ Chili. Herb. Dombey”) were considered as duplicates by Parodi (l.c.), since Dombey travelled alongside Ruíz & Pavón to Peru and Chile. It is not possible to know, however, the exact material used to describe the species, so the specimen from MA should be considered the lectotype [Article 9.17, Recommendation 9A (1&2) in Turland et al. (2018)].