Isocoma acradenia var. bracteosa
Phytologia 70: 81. 1991.
Endemic
Basionym: Isocoma bracteosa Greene Leafl. Bot. Observ. Crit. 1: 170. 1906
Synonyms: Haplopappus acradenius subsp. bracteosus (Greene) H. M. Hall
Leaf blades mostly 50–150 mm, margins of proximal usually shallowly toothed, of distal entire or serrulate. Involucres 7–8 mm. Phyllary apices spinulose-aristate. Florets 20–27. 2n = 12.
Phenology: Flowering Aug–Oct.
Habitat: Salt flats
Elevation: 0–20 m
Discussion
In the limited zone of contact between vars. bracteosa and acradenia, intermediates are rare. The two differ in chromosome number and significantly in habitat (altitudes are essentially non-overlapping). Field studies may show them to warrant distinction at specific rank.
Selected References
None.
Lower Taxa
None.