Eltroplectris paranaënsis Engels & E.C.Smidt, Engels & E. C. Smidt, 2023

Engels, Mathias Erich, Silva-Pereira, Viviane Da & Smidt, Eric De Camargo, 2023, Eltroplectris paranaënsis: a new species of Spiranthinae (Orchidaceae) from the nebular Atlantic Rain Forest, Phytotaxa 609 (2), pp. 115-123 : 117-120

publication ID

https://doi.org/10.11646/phytotaxa.609.2.3

DOI

https://doi.org/10.5281/zenodo.8272267

persistent identifier

https://treatment.plazi.org/id/311D87B8-FFCD-EC4A-3B8F-F81C64D4FBE0

treatment provided by

Plazi

scientific name

Eltroplectris paranaënsis Engels & E.C.Smidt
status

sp. nov.

Eltroplectris paranaënsis Engels & E.C.Smidt , sp. nov. ( Figures 2–3 View FIGURE 2 View FIGURE 3 )

Type: — BRAZIL. Paraná: Campina Grande do Sul, Serra do Mar , fl., 27 April 2022, M. E . Engels , L . Passos , T. F . Santos & M . Klingelfus 9669 ( holotype UPCB!) .

Similar to E. janeirensis ( Porto & Brade 1940: 33) Pabst (1974: 469) but differs from this by the narrow elliptical-lanceolate leaves; pauciflorous inflorescence; externally glabrous flowers; oblanceolate petals and central lobe of the lip with entire margins.

Description:— Humicolous acaulescent herbs, 26–27 cm tall. Roots 2.7–4.8 × 0.3–0.4 cm, appearing fasciculate, cylindrical, pilose. Leaves pseudo-petiolate, rosulate; pseudopetiole 3.4–4.5 × 0.2–0.3 cm, conduplicate; blade 8.5– 10.2 × 1.4– 1.3 cm narrowly elliptical-lanceolate, dark green, discolored, base acute and decurrent, margin entire, apex acute. Inflorescence racemose, erect, 1–2-flowered; peduncle 23.9–24 × 0.15–0.2 cm, cylindrical, pubescent in apical portion, green; rachis ca. 1.6 × 0.1 cm, cylindrical, pubescent, green; peduncle bracts 2.1–2.7 × 0.4–0.5 cm, amplective, narrowly triangular to narrowly lanceolate, glabrous, green, margin entire, apex acute; floral bracts 1.5–1.6 × 0.2– 0.4 cm, elliptical-lanceolate, glabrous, green, base acute, margin entire, apex acute. Flowers resupinate; pedicellate ovary 2.3–2.5 × 0.3 cm, glabrous, light-green; dorsal sepal ca. 1.7 × 0.7 cm, lanceolate, concave, base acute, margin entire, apex acute, glabrous, light green; lateral sepals ca. 2.0 × 0.5 cm (free portion, excluding the calcar), narrowly lanceolate, slightly asymmetrical, base long decurrent on the ventral portion of the ovary and forming a calcar, light-green, glabrous, margin entire, apex acute; calcar 1.5–1.7 × 0.2 cm, cylindrical, free, white, formed from the free part of the column foot, base of the lateral sepals and base of the lip; petals ca. 1.5 × 0.6 cm, asymmetrical, oblanceolate, base acute, margin entire, apex obtuse, white with light green apex; lip ca. 2.5 × 0.75 cm, unguiculate, white with light green apex; unguicule ca. 9 × 3.5 mm, oblong; blade trilobed; medial portion ca. 9 × 7.5 mm, oblanceolate; lateral lobes rounded; apical lobe ca. 7 × 4 mm, oval-lanceolate, base rounded-obtuse, margin entire, apex acute. Column 1 × 0.2 cm (excluding column foot), flattened ventrally, above rostrate and cucullate, whitish; column foot 1.5–1.7 cm long, flattened, with oblanceoloid unicellular glandular trichomes on the ventral side; rostellum ca. 4 mm long, long narrowly apiculate, acute. Anther ca. 4 × 2 mm, narrowly lanceolate, base cordate, margin sinuate, apex acute, brownish. Stigma bilobed, lanceolate, confluent at the apex, ca. 2 × 1 mm, white. Pollinarium with two narrowly oblanceolate, whitish pollinia, ca. 5 mm long; viscidium ca. 0.7 mm long, deltoid, apex sub-rounded, whitish hyaline. Fruits not seen.

Distribution and ecology: —Known only by the population in the type locality, where it occurs as a humicolous in the understory litter of the Upper Montane Dense Ombrophilous Forest at an elevation of 1200 m. Found flowering in April, during autumn in the Southern Hemisphere.

Etymology: —The specific epithet refers to the Paraná State, where the species was discovered.

Taxonomic discussion: —Among the congeners, E. paranaënsis is morphologically related to E. janeirensis and E. schlechteriana ( Porto & Brade 1940: 32) Pabst (1974: 469) , due to the presence of leaves at anthesis; light-green and white flowers; floral display with wide, open petals; trilobed lip and the shape of the central lobe (i.e. deltoid, ovate to lanceolate and not fimbriate). Eltroplectris paranaënsis can be distinguished from E. janeirensis by its smaller habit ( 26–27 cm total height vs. 75–80 cm); narrow, smaller leaves (narrowly elliptical-lanceolate, base acute, 8.5–10.2 × 1.4– 1.3 cm vs. ovate-subrounded, base rounded, ca. 15 × 10.5 cm), ovate petals ( vs. oblanceolate); lip with apical lobe proportionally shorter than the median portion (1/3 vs. 1/1) and lip with smooth apical lobe margin ( vs. little denticulation). It differs from E. schlechteriana in its smaller habit ( 26–27 cm total height vs. 50–70 cm); narrow, smaller leaves (narrowly elliptical-lanceolate, base acute, 8.5–10.2 × 1.4– 1.3 cm vs. ovate to ovate-lanceolate, base rounded, ca. 13–20 × 6–9 cm); lip with apical lobe proportionally shorter than the median portion (1/3 vs. 1/1) and lip with smooth apical lobe margin ( vs. little denticulation).

Additionally, E. paranaënsis is similar to E. assumpcaoana Campacci & Kautsky (1999: 108) and E. kuhlmanniana ( Hoehne 1944: 133) Szlachetko & Rutkowski (2008: 164) due to the presence of leaves at anthesis and the habit with relatively narrow leaves (i.e., narrowly elliptical-lanceolate, lanceolate or oblong-lanceolate). However, E. paranaënsis can be distinguished from E. assumpcaoana by the short pseudopetiole ( 3.4–4.5 cm long vs. 12–16 cm long), number of flowers per inflorescence (1–2 flowers vs. ca. 9 flowers), flower coloration (light green and white vs. brown and white), lip with apical lobe proportionally shorter than the median portion (1/3 vs. ca. 1/1) and by the shape of the apical lobe (oval-lanceolate vs. large-linear). Eltroplectris paranaënsis differs from E. kuhlmanniana by the short pseudopetiole ( 3.4–4.5 cm long vs. 10.5–17 cm long), reduced number of flowers (1–2 vs. ca. 9), by the length of the calcar (proportionately shorter than the ovary + pedicel vs. the same length to longer) and by the shape of the apical lobe of the lip (oval-lanceolate vs. subovate-obcordate).

M

Botanische Staatssammlung München

E

Royal Botanic Garden Edinburgh

L

Nationaal Herbarium Nederland, Leiden University branch

T

Tavera, Department of Geology and Geophysics

F

Field Museum of Natural History, Botany Department

UPCB

Universidade Federal do Paraná

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