Getting to know your Hawaiian Lobeliads #35: Trematolobelia macrostachys

Trematolobelia macrostacys

Trematolobelia macrostachys

  • Conservation Status: Apparently secure
  • Distribution: O’ahu (Ko’olau), Moloka’i, Maui
  • Date photographed: 11/15/2012
  • Ease of viewing: Difficult
  • *Identification: Form– Treelets 1-4 m tall Leaves– linear to oblanceolate, blades 15-36 cm long, 0.8-3.1 cm wide. Flower– calyx lobes triangular, 3-17 mm long, 1-3 mm wide; corolla various shades of pink, subbilabiate, 43-73 mm long.
  • Phylogenetic comments: Trematolobelia macrostacys is the only species in the endemic genus found on multiple islands. The genus itself is thought to be the sister clade of Lobelia sect. Galeatella
  • My notes: Once again my O’ahu love is showing. The first plants discovered in this genus were from the summits behind Honolulu by George T. Lay sometime between 1826-1827. It is neat for me to think the same areas where I see them now are the same areas where they were first scientifically described all those years ago. Unlike other capsular lobeliads, the fruits don’t dehisce by loculicidal slits, but by irregular pores throughout the fruit walls. The dry fruit have been colorfully called “pepper shakers” in some circles (i.e. my nerdy plant friends). T. macrostachys typically flowers from September through November. It is always a spectacular side bonus to any summit hike to come across one in full infloresence!
  • Links: Smithsonian Flora of the Hawaiian Islands
  • Refs: Lammers, Thomas G. “Revision of the endemic Hawaiian genus Trematolobelia (Campanulaceae: Lobelioideae).” Brittonia 61.2 (2009): 126-143.
  • Additional Photos:

Trematolobelia macrostacys

*From Manual of the Flowering Plants of Hawai’i

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