Stenostephanus brevistamineus

Stenostephanus brevistamineus is a species of flowering plant first collected 11 July 2013 in Junín, Peru. Stenostephanus is a genus in the plant family of Acanthaceae. The species holotype is housed at HOXA, with isotypes at MO and USM.

Wikipedia-Autoren · CC BY-SA · Quelle

Stephanostephanus brevistamineus is a perennial subshrub, to c. 1 m tall. Stem is erect, simple below, much-branched above, quadrangular, glabrous, the nodes swollen. Leaves slightly unequal in each pair, petiolate, glabrous; lamina membranaceous, 3.8 – 10.5 × 0.8 – 3.5 cm, oblong-elliptic, apex acuminate, base acute, margin entire, slightly undulate, venation camptodromous, lateral veins 6 – 8 pairs, adaxially, green, with numerous small cystoliths and impressed veins, abaxially shiny, veins prominent, reticulate; petiole 0.2 – 1.3 cm long. Inflorescence a pedunculate, ovoid, lavender terminal thyrse, 3 – 8 × 5 cm; peduncle 1 – 6 cm long, pubescent; rachis densely glandular-pubescent, the flowers arranged in opposite-decussate 3-flowered dichasia, the central flower subsessile, the laterals pedicellate with terete, pubescent pedicels to 2 mm in length; bracts at branching points 2 – 2.5 mm long, deltoid, acute, glabrous or nearly so; bracteoles 1.5 – 3 mm long, equal, linear, puberulent; calyx subequally 5-lobed to near the base, lobes linear, acuminate often with recurved apex, 7 – 8.5 × 0.5 mm, shortly puberulent, light green; corolla obscurely 2-lipped, subequally 4-lobed, 7 – 7.5 mm long, lavender; tube 4 – 6 mm long, 1 – 1.5 mm diam, ±equalling lobes, glabrous; lobes 4.5 – 5 × 1 mm, oblong, rounded, equal, glabrous; stamens 2, filaments glabrous, 3 mm long; anthers 2 mm long, muticous, glabrous, held at corolla mouth; style c. 6 mm, glabrous; stigma head subglobose, flattened; ovary pubescent. Capsule 10 – 11 × 2.5 mm, clavate, densely pubescent; seeds 4, 1 × 1 mm, elliptic, yellowish-brown, muricate. This species is distinguished in part by the pyramidal thyrse, which is almost entirely lavender in color.