Single Plant and Rhizome
Hudson Bay Regional Park
The specimen illustrated here does not have all the attributes of S. tabernaemontani. However, I have identified it as S. tabernaemontani because the spikelets are mostly either single or found in glomerules of two or three spikelets, rather than in glomerules of three to eight spikelets. In addition, the spikelets are generally less than one cm long and the scales are a generally a rich chestnut brown (not pale with red spots).
Acutus: Answers to key questions in Rushes, Bulrushes & Pondweeds plus the remaining Monocots of Saskatchewan by V. L. Harms, A. L. Leighton, and M. A. Vetter leading to this species. The answers are in the order you would normally work through the key.
Schoenoplectus: Answers to key questions in Rushes, Bulrushes & Pondweeds plus the remaining Monocots of Saskatchewan by V. L. Harms, A. L. Leighton, and M. A. Vetter leading to this genus. The answers are in the order you would normally work through the key.
Cyperaceae: Answers to key questions in Budd's Flora leading to this family.
Schoenoplectus tabernaemontani belongs to the very difficult Schoenoplectus lacustris complex. In fact, one author (T. Koyama) placed all members of the complex in a single species (Scirpus lacustris). One other member of the complex (Schoenoplectus acutis) is found in Saskatchewan and the two species occasionally hybridize.
Different flora have used different characteristics to differentiate between Schoenoplectus acutus and Schoenoplectus tabernaemontani. The following table lists all of these. Note that Budd's Flora directly contradicts Flora of the Great Plains regarding the relative lengths of the scale and achene.
|Flora||S. acutus||S. tabernaemontani|
|Budd's Flora||scales much longer than the achenes||scales almost as long as the achenes|
|Budd's Flora||scales narrowly ovate||scales broadly ovate|
|Budd's Flora||culms firm||culms spongy|
|Budd's Flora||spikelets 1-2 cm long||spikelets 3-7 mm long|
|Flora of Alberta||culms firm||culms soft|
|Flora of Alberta||inflorescence erect, often compact||inflorescence often drooping|
|Flora of Alberta||scales laciniate-fimbriate||scales ciliolate|
|Flora of Alberta||scales pale with conspicuous reddish brown striae||scales a rich chestnut brown|
|Flora of Alberta||achenes 1.8-3.0 mm long||achenes 1.4-2.2 mm long|
|Flora of the Great Plains||spikelets usually in glomerules of 3-8||spikelets usually in glomerules of 2, seldom 3 or single|
|Flora of the Great Plains||spikelets sessile or on short stiff pedicels||spikelets on long, lax pedicels|
|Flora of the Great Plains||scales shorter than or equal to achenes||scales exceeding the achenes|
|Flora of the Great Plains||culms firm||culms soft|
|Flora of the Great Plains||culms dark green||culms light green|
|Flora of North America||spikelet scale awns (sometimes broken off) mostly strongly contorted, rarely all straight||spikelet scale awns straight to bent|
|Flora of North America||spikelet scale awns 0.5–2 mm||spikelet scale awns 0.2–0.8 mm|
|Flora of North America||scales wholly or partly pale and prominently spotted at 10X||scales (except often midribs) uniformly orangish, or sometimes straw-colored and prominently spotted at 10X|
|Flora of North America||scale flanks sparsely to often densely scabrous||scale flanks smooth or very sparsely (rarely densely) scabrous|
|Flora of North America||some spikelets always clustered.||spikelets often all solitary|
|Flora of North America||widest air spaces in upper 1/4 of culm 0.5 (east)–1.5(–2.5) (west) mm wide.||widest air spaces in upper 1/4 of culm 1–2.5 mm wide.|