Menonvillea minima Rollins (1955: 52)
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publication ID |
https://doi.org/ 10.11646/phytotaxa.162.5.1 |
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persistent identifier |
https://treatment.plazi.org/id/03EF87C8-017D-A475-029F-FDC5FDBEFC78 |
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treatment provided by |
Felipe |
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scientific name |
Menonvillea minima Rollins (1955: 52) |
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18. Menonvillea minima Rollins (1955: 52) View in CoL . Type:— CHILE. [Región de Atacama]. Prov. Huasco, Huasco , September 1885, F . Philippi 1948 (lectotype here designated SGO 77941!; isolectotypes G!, SGO 77940!, probable isolectotype SGO 68272!) .
Annuals. Stems (1.5−)38(−10) cm, highly branched at base, usually irregularly winged, glabrous throughout. Leaves basal and cauline, sessile to subsessile; blade linear, trifid to deeply 3-lobed or entire, rarely subpinnately lobed or dentate, 1−3 cm × 1−3(−6) mm, attenuate to a petiole-like base, glabrous or with few, simple crisped trichomes to 0.3 mm long. Racemes terminal and axillary, densely flowered, ebracteate, corymbose, elongated in fruit, 2−4.5 cm long; rachis glabrous, straight, winged; fruiting pedicels divaricate, 5−8(−10) mm long, usually arcuate, glabrous, winged abaxially. Sepals oblong, 1.5−2.5 × 1.5−1.7 mm, glabrous, erect, not saccate at base, persistent at fruit maturity, margin membranous; petals creamy white, broadly obovate, 3−4 × (1.5−) 2−2.5 mm, base clawlike, glabrous, not papillate; stamens subequal in length; filaments free, neither dilated nor papillate at base, 1.7−2.5 mm long; anthers ovoid, 0.4−0.5(–0.6) mm long; nectar glands confluent, somewhat petaloid. Fruits globose, glabrous; valves hemispherical to slightly longer than broad, strongly convex dorsally, flat ventrally, 1.2– 1.5(−1.8) × 1−1.2(−1.4) mm, corky, verrucose to rugose or rarely smooth, with a conspicuous midvein dorsally, wingless or with rudimentary wings to 0.2 mm wide; gynophore to 0.5 mm long; style 1−1.5 mm long; stigma slightly 2-lobed. Seeds ovate, 0.8−1 × 0.6−0.7 mm, plump; cotyledons incumbent. Fig. 20 View FIGURE 20 .
Distribution and habitat:— Menonvillea minima is endemic to Region III (Atacama) of Chile along the coastal areas of Huasco and Freirina provinces. It grows on sandy soils at elevations to 100 m ( Fig. 13H View FIGURE 13 ).
Phenology: —Flowers between September and October.
Taxonomic notes:— Menonvillea minima is easily distinguished from other annual species of the genus by being small plants with conspicuously winged pedicels and hemispherical and wingless fruit valves. Menonvillea zuloagaensis , another species with wingless fruits, differs by its perennial habit, long-petiolate and palmately lobed (vs. sessile to subsessile and, deeply 3-lobed, entire or rarely subpinnately lobed) leaves and persistent (vs. caducous) sepals, petals and stamens.
Rollins (1955) cited type of M. minima as “Huasco, Sept 1885, F. Philippi 1948 ( SGO)” and an isotype from G. However, SGO has two sheets with the same locality data ( SGO 77941 and SGO 77940). Therefore, the sheet SGO 77941, which was annotated by Rollins in 1952 at the type, is designated herein as the lectotype .
Al-Shehbaz et al. (2011) designated SGO 63208 as an isolectotype of M. parvula Phil. , but its label reads “Huasco, Sep 1885, F. Philippi ” and suggests that the specimen belongs to the type collection of M. minima . The type of M. parvula is labeled as “Huasco, Oct 1866, F. Philippi ” ( Philippi, 1892; see M. parvula under synonymy of M. chilensis ).
Representative Specimens:— CHILE. III Atacama: Prov. Huasco, Com. Freirina, Playa de Carrizalillo , a 6 km del pueblo de Carrizalillo, 23 September 1941, Muñoz & Johnson 1990 ( SGO); Com. Huasco, Huasco, 19 September 1966, Montero 7619 ( CONC) .
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