Mezoneuron montrouzieri Guillaumin

Clark, Ruth P., 2016, A Taxonomic Revision of Mezoneuron (Leguminosae: Caesalpinioideae: Caesalpinieae), Phytotaxa 274 (1), pp. 448-450 : 448-450

publication ID	https://doi.org/ 10.11646/phytotaxa.274.1.1
persistent identifier	https://treatment.plazi.org/id/03981525-FFBB-FFB5-FF11-FD49FD200AD0
treatment provided by	Felipe
scientific name	Mezoneuron montrouzieri Guillaumin
status

Treatment

24. Mezoneuron montrouzieri Guillaumin View in CoL in Guillaumin & Beauvisage, Species Montrouzieranae. Annales de la Société Botanique de Lyon 38: 87–88. 1913.

Lectotype:— NEW CALEDONIA: Taulé, Deplanche 338, P (P00379688!); isolectotypes:—K!, L (L0651493!), NY!, P (P00625915!), Clark & Gagnon 2015.

Remaining syntypes:— NEW CALEDONIA: Taulé , Deplanche 340 K (K000264184!), L (L0651493!), NY!, P (P00379688!, P00625915!, P 02142824!); Taulé, Vieillard 2521, P (P00379687!, P 02142820!, P 02142822! P 02142823!); Ile Art (49 in herb. Lugd.) Mueller: 3, 12; Deplanche 558 P! (barcode unknown) .

Synonym. M. deverdiana Guillaumin , Bulletin de la Société Botanique de France 83: 310. 1936.

Syntypes:— NEW CALEDONIA: Cap Deverd , Vieillard 2533 (specimen not seen, the number as written in the protologue is possibly a typographic error, as the specimen Vieillard 2523! is determined as M. deverdiana ); Cap Deverd , Deplanche 341 K (K000556379!), NY!, P (P00379664!, P00379665!, P00379689!, P00379690!); Cap Deverd, Pancher 41 (location of specimen unknown) .

Synonym. M. deverdiana Guillaumin var. glabrifoliolula Guillaumin. Bulletin de la Société Botanique de France 83: 310.

Syntypes:— NEW CALEDONIA: Route de Canala , Balansa, B. 2447 L (L0651586!), P (P00379662!, P00379663!, P00624907!); prés de l’embouchure du Dothio, Balansa, B. 3668 P (P00379661!, P00379686!); Taulé, Vieillard 2522 P !.

Scrambling shrub to ca. 6 m in length. Stems unarmed, or with scattered recurved prickles, glabrous to very sparsely to moderately whitish to ferruginous tomentose. Stipules semi-persistent, triangular, ca. 1–2 × 0.5 mm, moderately tomentose, or hairs on margins only. Leaves with 1–6 opposite pairs pinnae; 1–6 pairs leaflets per pinna; petioles 1.8–8.5 cm; leaf rhachis (1.5–) 5.4–25 (–28.8) cm, unarmed or with recurved prickles in pairs at pinna insertion points, and scattered on the internodes (particularly on younger leaves); pinnae (0.8–) 2.4–7 cm; leaf rhachis, petiole, and pinna rhachis sparsely to moderately whitish to orange pilose, tomentose, or villous. Leaflets opposite to subopposite, shape variable, with irregular margin, elliptic to orbicular, base oblique, apex obtuse, rounded or retuse, margin inrolled; the terminal leaflets (1.2–) 1.5–3.6 (–4.3) × 0.8–2.5 (–3.3) cm; lateral leaflets (1.1–) 1.6–3.4 × 0.8–2.6 cm; both surfaces glabrous to sparsely, occasionally moderately, tomentose, with somewhat appressed, whitish to ferruginous hairs; 2˚ veins anastomosing, 3˚ veins reticulate, veins slightly sunken above and raised below. Inflorescence a panicle, often few-branched, axillary or terminal, flowers spaced up to 6 mm apart, 8–30 cm long, glabrous or sparsely to densely ferruginous tomentose; pedicels 2–7 mm, articulated ca. 1–2 mm below calyx, sparsely to moderately (densely when very young) ferruginous tomentose. Bracts sometimes present, triangular, c. 0.5–1 × 0.5 mm, partially tomentose; bracteoles linear or lanceolate, apex acute, 1.5–4 × 0.5–1 mm, sparsely to densely ferruginous tomentose. Flowers with a hypanthium ca. 1 mm deep, glabrous or sparsely to moderately ferruginous tomentose, or hairs on margins only; lower calyx lobe 4–6 × 2–3 mm; other lobes 3–6 × 2–3 mm, glabrous or sparsely to moderately ferruginous tomentose. Median petal 3–6 × 1.5–3 mm, with a patch of translucent or ferruginous hair on inner surface between claw and blade, and hairs on margins of claw, outer surface glabrous. Upper lateral petals elliptic to slightly obovate, 3–6 × 1.5–2 mm, blade glabrous, claw very sparsely ferruginous tomentose on inner surface. Lower lateral petals elliptic to slightly obovate, 3–6 × 1.5–2 mm, blade glabrous, claw very sparsely ferruginous tomentose on inner surface. Stamen filaments flattened, (2–) 3–6 mm long, sparsely to densely tomentose, with long, translucent or whitish to ferruginous hairs on the basal ½ of the inner face or both faces; anthers ca. 0.75–1 mm long. Ovary 2–3 mm long, glabrous, or densely pubescent with translucent, whitish, or

A TAXONOMIC REVISION OF MEZONEURON

Phytotaxa 274 (1) © 2016 Magnolia Press • 41 ferruginous hairs, style 3–5 mm long, very sparsely pubescent on the basal ½; stigma funnel-shaped, the rim papillate. Fruit elliptic, the base cuneate, apex acute or the the wing extending to form a short beak; 2.4–5.4 × 1.4–2.4 cm, wing 2–4 mm; fruit surface glabrous or subglabrous, or sparsely to moderately ferruginous tomentose, glossy; venation reticulate, raised and visible on the fruit body, no veins visible on the wing; hypanthium persistent. Seeds 1 per fruit, suborbicular, not or faintly visible in outline on fruit exterior when mature.

Distribution:— Endemic to New Caledonia. Distributed mostly on the west coast in the northern half of the island, with two localities on the East coast, in the southern part of the island. Ile Art; Grand Terre, North and South Provinces (primarily North), East to West (primarily West). ( Fig. 27).

Habitat and ecology:—Maquis and sclerophyllous forest, on ultramaphic or non ultramaphic soil. Elevation 1–900 m.

Phenology:—Flowering December–August, fruiting November–July.

Preliminary conservation assessment:—Extent of Occurrence 15,220.484 km ² = VU; Area of Occupancy 60.00 km² = EN.

Category Assigned:—Least Concern (LC). This species does not seem directly threatened. (RLA Flore NC 2016).

New Combinations (fossil taxa)

Mezoneuron claibornensis (Herendeen & Dilcher) R. Clark & E. Gagnon comb. nov.

Holotype:— Warman (Indiana University (I.U.) Locality 15826: Como Quad., Weakley Co., Tennessee, 36 17 15–30 N, 88 31 35–45 W) and Puryear (I.U. Locality 15820: Puryear Quad., Henry Co. , Tennessee, 36 26 17 N, 88 20 15 W) clay pits, Claiborne Formation , western Tennessee, IU 15826-5853, 5853'. GoogleMaps

Basionym. Caesalpinia claibornensis Herendeen & Dilcher. Am. J. Bot. 78 (1): 3. 1991.

Mezoneuron flumen-viridensis (Herendeen & Dilcher) R. Clark & E. Gagnon comb. nov.

Holotype:— Little Mountain , Green River Formation, southwestern Wyoming (I.U. Locality 15882: NW ¼ SE ¼ Sec. 23, T13N, R106W, Sweetwater Co.), IU 15882-7388, 7388'.

Basionym. Caesalpinia flumen-viridensis Herendeen & Dilcher. Am. J. Bot. 78 (1): 8. 1991.

Mezoneuron spokanensis (Knowlton) R. Clark & E. Gagnon comb. nov.

Lectotype:— Deep Creek , north of Spokane, Washington ( United States Geological Survey locality 7557), USNM 37011.

Basionym. Caesalpinia spokanensis (Knowlton) Herendeen & Dilcher. Am. J. Bot. 78 (1): 8. 1991.

CLARK

Synonym. Cercis? spokanensis Knowlton. Knowlton 1926 , U.S. Geol. Surv. Prof. Pap. 140: 43, P1. 29, Fig. 9 View FIGURE 9 .

Synonym. Cercis idahoensis Berry. Berry 1931 , Bull. Torrey Bot. Club. 57: 240–243, P1. 1, Figs. 1–3 View FIGURE 1 View FIGURE 2 . Berry 1934, U.S. Geol. Surv. Prof. Pap. 185: 114, P1. 22, Figs. 1–3; P1. 23 View FIGURE 1 View FIGURE 2 , Figs. 5, 6.

Synonym. Cercis spokanensis Knowlton. Brown 1937 , J. Wash. Acad. Sci. 27: 177, P1. 54, Figs. 10–12.

Excluded Names

Mezoneuron benguetense (Elmer) Elmer Leafl. Philipp. Bot. View in CoL i: 362. 1908. = Caesalpinia decapetala (Roth) Alston. View in CoL A Handbook to the Flora of Ceylon VI, Suppl.: 89. 1931.

Mezoneuron grande Miquel. Fl. Ned. Ind., Eerste Bijv. View in CoL 2: 291. 1861. = Acrocarpus fraxinifolius Arnott. Mag. Zool. Bot. View in CoL 2(12): 547. 1839.

Mezoneuron welwitschianum Oliver. In Oliver et al. Fl. Trop. Afr. View in CoL 2: 261. 1871. = Caesalpinia welwitschiana (Oliver) Brenan. Kew Bull. View in CoL 17(2): 203. 1963.