Ourisia crosbyi

Detailed description

Perennial herb 132-490 mm tall, with erect leaves and inflorescences; stems 2.4-11.0 mm diameter, internodes 8.5-12.0 mm long, often obscured by leaves, mostly glabrous. Leaves opposite, along creeping stems, densely packed near growing tip; petiole 5.0-145.0 x 0.6-1.4 mm, sparsely or densely eglandular pilose or villous especially along margins; lamina 14.2-116.0 x 7.8-65.0 mm, narrowly ovate, ovate to broadly ovate, apex acute to subacute, base truncate, rarely cuneate or cordate, margin serrate or serrate-crenate, leaf surfaces, sparsely or densely eglandular pilose near apex (on undersides especially on veins). Inflorescence racemose, 1-40-flowered, 142-490 mm long, bracteate, with 3-6 flowering nodes, 2-12 bracts and 1-12 flowers per node; peduncle 1.2-5.9 mm diameter, densely eglandular pilose. Floral bracts up to 13.6-45.1 x 4.0-32.0 mm, sessile sometimes clasping peduncle, lanceolate, narrowly ovate to ovate, margins serrate, upper bracts with further teeth or subentire, eglandular pilose, sometimes only on margins or veins of undersides. Flowers 10.5-20.4 x 8.0-17.0 mm; pedicel 6.3-48.6 mm long, densely eglandular pilose. Calyx 4.2-7.8 x 4.2-9.3 mm, regular, externally and marginally eglandular pubescent, internally mostly glabrous, calyx lobes 4.3-8.1 x 0.6-1.6 mm, posterior all equally divided to base, narrowly lanceolate to lanceolate, apex acute or rounded, prominently 3-veined. Corolla 14.5-19.9 x 14.9-19.5 mm when flattened, bilabiate, tubular-funnelform, white, externally glabrous; tube 4.3-10.7 x 4.1-5.9 mm at apex, 2.4-3.8 mm wide at base, not constricted near base, slightly curved or straight, yellow inside; anterior corolla lobes 6.5-9.9 x 4.7-7.2 at widest point, 2.5-3.3 mm wide at base, posterior corolla lobes 4.3-7.5 x 4.4-7.9 mm wide at widest point, 2.6-2.9 mm wide at base, widely spreading, obcordate or obovate-spathulate, apex emarginate or not. Stamens 4, didynamous; comprising two long stamens 6.7-9.4 mm long, reaching tube opening, and two short stamens 4.5-7.0 mm long; anthers 0.5-1.0 x 0.6-1.2 mm, reniform to horseshoe-shaped; staminode if present c.0.6-0.9 mm long, inserted c.0.3-0.5 mm above base of corolla. Style 4.3-5.4 mm long, straight or angled from base, exserted or flush with tube opening; stigma 0.6-1.1 mm diameter, emarginate; ovary 2.6-3.9 x 1.3-2.3 mm, glabrous. Capsules 4.0-8.2 x 3.0-5.9 mm, glabrous, dehiscence loculicidal. Seeds 0.5-0.9 x 0.2-0.6 mm.