Petrosimonia Bunge

Tutin, T. G., Heywood, V. H., Burges, N. A., Moore, D. M., Valentine, D. H., Walters, S. M. & Webb, D. A., 1964, Flora Europaea - Volume 1. Lycopodiaceae to Platanaceae, Cambridge University Press : 108

32. Petrosimonia Bunge 1

Annual, usually pubescent herbs. Leaves alternate or opposite, cylindrical or semicylindrical. Inflorescence a panicle, the flowers hermaphrodite, solitary, axillary; bracteoles 2, becoming hard and enclosing the fruit. Perianth-segments 2—5; stamens 1-5; stigmas 2. Seeds vertical, compressed parallel to the axis. All species occur in saline habitats. 1 Leaves all opposite; perianth-segments 5

1. brachiata 1 Middle and upper leaves alternate; perianth-segments almost always 2-3

2 Leaves c. 1 mm in diameter or less; stamens 1-3

3 Perianth-segments 3-4, all pubescent on the back; stamens

1-2 4. monandra 3 Perianth-segments 2-3, glabrous (rarely 1 pubescent on the back); stamens 2-3

4 Perianth-segments and stamens 3; lower leaves up to 50 mm

2. triandra 4 Perianth-segments and stamens mostly 2; lower leaves usually not more than 10 mm 3. litwinowii 2 Leaves (at least the lower) 2-3 mm in diameter; stamens 5

5 Apex of bracteoles deflexed, attenuate 7. glaucescens 5 Apex of bracteoles erect, not attenuate

6 Perianth-segments glabrous or shortly pubescent, becoming cartilaginous in fruit 5. oppositifolia 6 Perianth-segments long-ciliate, at least at the apex, not becoming cartilaginous in fruit 6. brachyphylla