Triglochin scilloides
awl-leaf arrow-grass, flowering quillwort

Distribution: Occurring chiefly west of the Cascades crest along the coastal counties in Washington; British Columbia to Baja California, Mexico, east to the Rocky Mountains and northern Great Plains; also in South America.

Habitat: Generally in shallow water, but often stranded in mud at edge of receding ponds, coastal tideflats to interior valleys.

Flowers: July-September

Origin: Native

Conservation Status: Not of concern


Tufted annual, submerged in youth, sometimes becoming emergent in age, glabrous, from fibrous roots.


Leaves basal, 5-20 cm long and 1-5 mm broad, somewhat elliptic or round in cross section; sheath membranous; ligule approximately 1 mm, tip generally obtuse or notched.


Inflorescence scapose, dense spike of bisexual and occasionally staminate flowers, typically emergent, 6-20 cm, also with submersed sessile pistillate flowers enclosed in leaf sheath at base of scape.

Fruits :

Achene 2-10 mm, ribbed, generally flat, somewhat winged in bisexual flowers, angled in pistillate flowers, tip truncate with off-center beak.

Accepted Name:
Triglochin scilloides (Poir.) von Mering & Kadereit
Publication: Diversity Phylogeny Evol. Monocotyledons 73. 2010.

Synonyms & Misapplications:
Lilaea scilloides (Poir.) Hauman [FNA22, HC]
Lilaea subulata Humb. & Bonpl. [Peck, Abrams]
Additional Resources:

PNW Herbaria: Specimen records of Triglochin scilloides in the Consortium of Pacific Northwest Herbaria database.

WA Flora Checklist: Triglochin scilloides checklist entry.

E-Flora BC: Triglochin scilloides atlas page.

CalPhotos: Triglochin scilloides photos.

USDA Plants: Triglochin scilloides information.

25 photographs:
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