Sisyrinchium angustifolium
Sisyrinchium campestre
Bermudienne à feuilles étroites, blue-eyed grass, narrow-leaf blue-eyed-grass, stout blue-eyed grass
prairie blue-eyed grass
branched, with 1–2 nodes, 2.3–5 mm wide, glabrous, margins often minutely denticulate especially basally, similar in color and texture to stem body;
first internode 10–30 cm, usually longer than leaves;
distalmost node with 1–3 branches.
simple, 1.2–2.5 mm wide, glabrous or scabrous, margins usually entire, similar in color and texture to stem body.
blades glabrous, bases not persistent in fibrous tufts.
blades usually glabrous, bases occasionally becoming fibrous but not persistent in tufts.
borne singly;
spathes usually green, obviously wider than supporting branch, glabrous, keels denticulate to entire;
outer 18–38 mm, 2–9.5 mm longer than inner, usually tapering evenly towards apex, margins basally connate 4–6 mm;
inner with keel evenly curved or straight, hyaline margins 0.1–0.3 mm wide, apex acuminate to acute, ending 0.2–0.7 mm proximal to green apex.
borne singly;
spathes green to purplish, glabrous or scabrous, keels usually entire;
outer 22–50 mm, 10–32 mm longer than inner, tapering evenly towards apex or occasionally slightly constricted proximal to apex, margins distinct or rarely connate basally to 1 mm;
inner with keel usually gibbous, hyaline margins 0.1–0.3 mm wide, apex acuminate to acute, ending 0.4–3.5 mm proximal to green apex.
tepals pale blue to violet, occasionally white, bases yellow;
outer tepals 7.7–12.5 mm, apex rounded or emarginate, aristate;
filaments connate ± entirely, stipitate-glandular basally;
ovary similar in color to foliage.
tepals white to pale blue, bases yellow;
outer tepals 7–12.7 mm, apex rounded to emarginate, aristate;
filaments connate ± entirely, stipitate-glandular basally;
ovary similar in color to foliage.
dark brown or black, sometimes with purplish tinge, ± globose, 4–7 mm;
pedicel spreading or ascending.
light to dark brown, globose, 3–5 mm;
pedicel spreading to ascending.
globose to obconic, lacking obvious depression, 0.5–1.2 mm, rugulose.
globose to obconic, lacking obvious depression, 0.5–1 mm, granular to rugulose.
= 96.
= 32.
Sisyrinchium angustifolium
Sisyrinchium campestre
Sisyrinchium membranaceum E. P. Bicknell probably belongs here; Bicknell indicated that its relationship was “with S. graminoides” and his description falls within that of S. angustifolium, except for slightly shorter spathe bracts.
In previous floras, Sisyrinchium angustifolium often has been confused with S. montanum, especially when S. graminoides was segregated. Branching seems to be the primary point of confusion. The original descriptions of S. angustifolium and S. graminoides clearly indicated branching while that of S. montanum indicates it to be single-stemmed. There is some slight similarity between S. montanum var. crebrum and S. angustifolium with respect to spathe connation and dry color, and chromosome counts indicate that both have 2n = 96, but there is some indication that breeding barriers may exist (D. B. Ward 1959).
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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