Herbertia, Sweet, 1827

Deble, Leonardo Paz & Alves, Fabiano da Silva, 2013, Herbertia amabilis Deble & F. S. Alves (Iridaceae), a new species from Brazil, Candollea 68 (1), pp. 133-137 : 136

Key to the Brazilian species of Herbertia :

1. Inner tepals white and dark purple striped, apex rounded to truncate. Anthers less than 3 mm long. Flowers white ......................................................................... H. zebrina

1a. Inner tepals not striped, apex obtuse to acuminate. Anthers 4 mm long or more. Flowers pale lilac, violet or blue, rarely white ............................................................................... 2

2. Androgynoecium filaments free for 3-5 mm long at the apex. Flowers blue or blue-violet. Outer tepals with a white to light blue streak........................................ H.pulchella

2a. Androgynoecium filaments entirely united, forming a column or free up to 2 mm long at the apex. Flowers white, pale violet, blue-violet or violet, without a white to light blue streak....................................................................... 3

3. Flowers white or pale lilac. Outer and inner tepals with a yellow stripe at the base. Ovary 3.5-5 mm long............. 4

3a. Flowers blue-violet or violet. Outer tepals whitish and dark violet spotted at the base. Inner tepals dark violet, without a yellow stripe at the base. Ovary 6-8.5 mm long .......... 5

4. Plant 8-22 cm high. Leaves 4-5 cm long. Anthers 4-5 mm long ................................................................... H.crosae

4a. Plant 30-40 cm high. Leaves 18-35 cm long. Anthers 7- 7.5 mm long................................................... H.amabilis

5. Flowers 55-65 mm wide. Outer tepals without a yellow medial stripe at the base. Androgynoecium filaments free for 1-1.5(-2) mm long at the apex............ H.quareimana

5a. Flowers 30-55 mm wide. Outer tepals with a yellow medial stripe at the base (rarely absent). Androgynoecium filaments entirely united, forming a column; anthers attached directly to the filament column....................................... 6

6. Leaves 10-20 mm wide. Style arms channeled, secondary divisions recurved.......................................... H.darwinii

6a. Leaves 4–10 mm wide. Style arms not channeled, secondary divisions straight...... H.lahue subsp. amoena