Odontarrhena

Cecchi, Lorenzo, Bettarini, Isabella, Colzi, Ilaria, Coppi, Andrea, Echevarria, Guillaume, Pazzagli, Luigia, Bani, Aida, Gonnelli, Cristina & Selvi, Federico, 2018, The genus Odontarrhena (Brassicaceae) in Albania: Taxonomy and Nickel accumulation in a critical group of metallophytes from a major serpentine hot-spot, Phytotaxa 351 (1), pp. 1-28 : 20-21

Key to Albanian taxa of Odontarrhena

1. Basal leaves obtuse at apex, orbicular-spathulate to broadly obovate, less than 1 cm long, densely covered on both surfaces with dense, whitish pubescence (more than one layer of trichomes); silicles obovate (wider in the upper half), their valves sharply asymmetrically inflated and S-shaped in cross-section; seeds unwinged or nearly so ....................................................... O. sibirica

1. Basal leaves usually rounded at apex, variable in shape but usually more than 1 cm long, with upper surface green to greyish-green, not covered with dense whitish pubescence (a single layer of trichomes); silicles elliptical to orbicular, with maximum width near the middle, their valves more or less symmetrically inflated, not S-shaped in cross section; seeds winged or unwinged................2

2. Silicle valves densely covered with stellate hairs.............................................................................................................. O. albiflora

2. Silicle valves glabrous or with sparse stellate hairs...........................................................................................................................3

3. Flowering stems up to 15(20) cm; inflorescence simple to 2-branched; seeds unwinged or almost so (2n = 16).............................4

3. Flowering stems (15)20–50(100) cm; inflorescence usually 3- to 4-branched; seeds winged (2n = 32)..........................................5

4. Basal leaves narrowly lanceolate, with indistinct petiole, up to 22 mm long; inflorescence a branched raceme; siliculae ca. 4 mm, with flat valves ...................................................................................................................................................................... O. rigida

4. Basal leaves obovate-spathulate, with distinct petiole, up to 12 mm long; inflorescence reduced to simple, terminal racemes; silicles up to 5.5 mm, with slightly undulate valves...................................................................................................... O. moravensis

5. Erect, with sterile shoots usually absent or few at flowering time and fertile stems branched in the upper quarter; leaves oblanceolate to narrowly spathulate, often incurved and gutter-folded, greenish to greyish below; lateral simple racemes with 20 fruits or more; pedicels thin, sometimes flexuous; silicles broadly elliptic to orbicular........................................................................ O. chalcidica

5. Erect-ascending, cushion-like, much branched from the base, with numerous sterile shoots and fertile stems often crowded, usually branched between their upper third and the middle, or even below; leaves broadly obovate-spathulate to almost orbicular, flat, white-silvery below; lateral simple racemes with (3)5–10(15) fruits; pedicels relatively thick and rigid; silicles almond-shaped to broadly elliptic....................................................................................................................................................................................6

6. Flowering stems up to 30 cm; inflorescence 2- to (rarely) 3-branched; silicles always almond-shaped, usually completely glabrous, ca. 5–5.5 mm long; flowering from May to July, fruiting from June to August ...................................... O. smolikana subsp. glabra

6. Flowering stems up to 50(90) cm; inflorescence 3- to (usually) 4-branched; silicles almond-shaped to broadly elliptic, sparsely hairy to glabrescent, ca. 2.5–4 mm long; flowering from June to August, fruiting from August to October .................. O. decipiens