Click the number at the start of a key lead to highlight both that lead and its corresponding lead. Click again to show only the two highlighted leads. Click a third time to return to the full key with the selected leads still highlighted.

Click images to enlarge and show more photo credit.

Key to Rayjacksonia

Asteraceae

Rayjacksonia

Copy permalink to share

1 Mid-cauline leaf blades linear to linear-oblanceolate, 1-3 (-4) mm wide; involucres 4-7 tall × 10-15 mm wide; rays 14-19, corollas 6.5-9.5 mm long; [West Gulf Coastal Plain of TX]
1 Mid-cauline leaf blades oblanceolate to oblong or oblong-lanceolate, (1-) 4-15 (-25) mm wide; involucres (4.5-) 6-15 tall × 9-30 mm wide; rays (13-) 17-38, corollas 6-19 mm long; [OK, TX, LA, MS, and FL].
  2 Heads on short, leafless or bracteate peduncles, not surpassed by distal leaves; phyllaries strongly unequal, ca. 0.9-1 mm wide, their apices broadly spreading to squarrose; [ec. OK westwards]
  2 Heads essentially sessile, often surpassed by distal leaves that continue to very base of heads; phyllaries subequal, 1.3-1.7 mm wide, their apices erect to spreading; [Gulf Coastal Plain].
    3 Stems 8–12 dm tall; involucres ca. 10 mm long, outer bracts linear-lanceolate to linear; [w. coast of peninsular FL; s. LA]
    3 Stems 1–4 dm tall; involucres 6–9 mm, outer bracts more or less foliaceous; [w. Panhandle of FL west through MS and LA to TX and TAM]