Calamagrostis tacomensis |
Greeneochloa tweedyi(synonym of Calamagrostis tweedyi) |
|
---|---|---|
Rainier reedgrass |
Cascade reedgrass, Tweedy's reedgrass |
|
Habit | Plants 55–95 cm tall; cespitose; generally without rhizomes but if rhizomes present about 2 cm long. | Plants (47)60–120(150) cm tall, lacking sterile culms; loosely cespitose; rhizomes 1–10 cm long, 2–4 mm thick. |
Leaves | sheaths and collars smooth, papillose to scabrous between veins; margins minutely scabrous distally; blades (3.7)7–40 cm × (1.5)2–5(8) mm; flat, glaucous; both surfaces scabrous or smooth. |
sheaths and collars smooth; blades (3)4–20(38)cm × (2)3–13 mm; flat; lower surfaces smooth; upper surfaces smooth or slightly scabrous, glabrous to sparsely to moderately pubescent on the veins. |
Inflorescences | 6.3–15 × 0.7–5 cm, loosely contracted; erect to slightly nodding; shiny green, purple, or brown; branches 1.5–6 cm, scabrous; spikelet-bearing to the base or nearly so. |
7–16(19) × (1)1.5–2 cm; erect, usually contracted; pale to dark purple; branches (0.2)2.4–6.7(7.7)cm; smooth, sometimes sparsely scabrous distally; spikelet-bearing to the base. |
Glumes | 3.2–5.8 mm, keeled, scabrous on keel, scabridulous elsewhere. |
(4.5)5.5– 8(9)mm, keeled. |
Calluses | with hairs 1.7–3 mm; about 50% as long as the lemma; abundant. |
with hairs 0.8–1 mm, 20–33% as long as the lemmas; sparse. |
Lemmas | 3.1–3.7(4)mm, 0.5–1.5 mm shorter than the glumes; lemma awns 3.4–5.5 mm, attached to the lower portion of the lemma, exserted 0.5– 2.3 mm beyond the glumes, easily distinguished from the callus hairs, strongly bent. |
4–6.5(7.5) mm, 0–1.5 mm shorter than the glumes, minutely scabrous; lemma awns 6–11 mm, attached to the lower portion of the lemma, exserted more than 2 mm from the spikelet; stout; bent. |
Anthers | (1)2–3.5 mm. |
2–3.5 mm. |
Calamagrostis tacomensis |
Greeneochloa tweedyi |
|
Distribution | ||
Discussion | Montane to alpine slopes, along rocky streamsides. 1900– 2700m. BR. WA. Native. Oregon plants treated here as C. tacomensis differ from typical members of the species in habit, foliage color, and spikelet traits. These plants will likely be described as a distinct species. |
[Originally published in Flora of Oregon as Calamagrostis tweedyi] Montane to subalpine meadows and conifer forests. 1700– 2100m. Casc. WA. Native. This uncommon Calamagrostis is recognized by its combination of broad leaves and long awns. Similar C. howellii, confined to the Columbia Gorge, has longer awns. |
Source | Flora of Oregon, volume 1, page 378 Barbara Wilson, Richard Brainerd, Nick Otting |
Flora of Oregon, volume 1 |
Sibling taxa | ||
Synonyms | Calamagrostis sesquiflora, Calamagrostis vaseyi | Calamagrostis tweedyi |
Web links |