1 | Ovary 7-10-lobed, nutlets 7-10 |
1' | Ovary 4-lobed; nutlets 4 |
2 | Corolla 7-9 mm in diam. Leaves elliptic- to obovate-oblong, strigose on margin and midrib, otherwise glabrous |
2' | Corolla c. 4 mm in diam. Leaves orbicular to ovate, conspicuously strigose on both faces |
3 | Leaves linear to linear-lanceolate, acute, not longer than 9 mm. |
3' | Leaves wider, oblong-obovate to oblanceolate, if linear then much longer than 9mm |
4 | Nutlets angulate dorsally, dorso-ventrally compressed; plants prostrate, flowers solitary above axils of upper leaves |
4' | Nutlets either angulate dorsally, dorso-ventrally compressed and plants upright in upper part with elongated cymes or nutlets rounded dorsally, or plants prostrate with solitary flowers in axils of upper leaves |
5 | Nutlets angulate dorsally, dorso-ventrally compressed; plants upright in the upper part, with elongated cymes |
5' | Nutlets rounded dorsally, laterally slightly compressed; plants creeping, prostrate; flowers solitary in the axils of upper leaves |
6 | Bases of lower leaves decurrent, upper leaves stalked |
6' | Bases of lower leaves rounded or tapering into a petiole |
7 | Leaves strigose along margins only; cymes axillary with 4-6 flowers; stems glabrous |
7' | Stems and leaves hirsute on whole surface; cymes terminal, often bifurcate, with more numerous flowers |
8 | Ovary and fruit finely hairy; leaves linear to oblong or oblong-lanceolate |
8' | Ovary and fruit glabrous; leaves oblong to elliptic |
9 | Calyx united for half of its length, lobes ovate-triangular |
9' | Calyx united for less than half of its length, lobes narrowly ovate to ovate-lanceolate |
10 | Stem densely patent hairy in its lower part, hairs reddish brown when dry. Leaves of flowering stems 0-1, broadest near base, semiamplexicaulous |
10' | Stem with more or less appressed, antrorse hairs in its whole length, hairs permanently white. All leaves tapering towards base, stalked |
11 | Corolla 4 mm long, tube c. 2 mm; both leaf surfaces densely strigose |
11' | Corolla 3-9 mm long, tube 2-3(-5) mm; upper leaf surface laxly strigose, hairs sometimes in irregular patches |
12 | Nutlets ciliolate along their margins |
12' | Nutlets glabrous or minutely papillate |
13 | Plant pulvinate with short stems crowded densely together. Leaves not longer than 8 mm |
13' | Plant not pulvinate, with elongate, more or less creeping stems. Leaves distinctly longer |
14 | Nutlets minutely papillate, gray or light-brown, dull |
14' | Nutlets smooth, blackish or black, rarely ivory white, shiny |
15 | Pedicels 0.5-1 mm long. Corolla 3-3.5 mm long, 4.5 mm across |
15' | Pedicels 8-12 mm long in flower, up to 18 mm in fruit. Corolla 9 mm long, 12 mm across |
16 | Leaves oblanceolate, gradually contracted into the petiole; nutlets lanceolate. Pedicels 2-5 mm long |
16' | Leaves obovate to elliptic, abruptly contracted into a short, sheathing petiole; nutlets short. Pedicels 1-3 mm in flower, up to 7 mm in fruit. |