Sisyrinchium angustifolium
Sisyrinchium ensigerum
Bermudienne à feuilles étroites, blue-eyed grass, narrow-leaf blue-eyed-grass, stout 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.
branched, with 1–2 nodes, 1.9–4.8 mm wide, glabrous, margins variously serrulate, denticulate, or entire, similar in color and texture to stem body;
first internode 2.6–19 cm, shorter than leaves;
distalmost node with 2–3 erect to arcuate branches.
blades glabrous, bases not persistent in fibrous tufts.
blades glabrous, bases not persistent in fibrous 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, obviously wider than supporting branch, glabrous, keels entire to denticulate;
outer 15–24.5 mm, 1.4 mm shorter to 2.2 mm longer than inner, tapering evenly towards apex, margins basally connate 2.5–4.5 mm;
inner with keel evenly curved, hyaline margins 0.3–0.6 mm wide, apex broadly acute to obtuse or lobed, 0.8 mm shorter to 0.4 mm longer than 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 blue to light bluish violet, bases yellow;
outer tepals 8–15 mm, apex rounded to occasionally slightly 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, obovoid to ± globose, 3.8–5.3 mm;
pedicel erect to spreading.
globose to obconic, lacking obvious depression, 0.5–1.2 mm, rugulose.
globose to obconic, with slight depression on one side, 1–1.5 mm, rugulose.
= 96.
= 32.
Sisyrinchium angustifolium
Sisyrinchium ensigerum
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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