Iris purdyi |
Iris tridentata |
|
---|---|---|
Purdy's iris, redwood iris |
savannah iris |
|
Rhizomes | much branched, forming dense clumps, dark red-brown, very slender, 0.3–0.6 cm diam., covered with remains of old leaves; roots fibrous. |
extensively branching, to 12 × 0.5–0.7 cm, becoming 1.5–2 cm diam., with coarse, strongly ribbed, brown, scalelike leaves. |
Stems | simple, solid, 1.5–2.5 dm. |
simple or rarely 1-branched, 3–7 dm. |
Leaves | basal few, laxly spreading, longer than stem, blade bright dark green adaxially, flushed pink basally, veins subprominent, linear, 2.8–4.8 dm × 0.5–0.8 cm, rather glaucous abaxially, margins thickened, apex acute; cauline imbricated, sheathing, free only at tips, bracteiform, blade green edged with pink, strongly striate, inflated, apex acuminate. |
basal with blade green, often with red-brown margins, lightly ribbed, linear-ensiform, 3–5 dm × 1.5–2.3 cm, glaucous, apex acute; cauline 2–3, spreading, blade narrowly linear, 0.5–0.7 cm wide, apex acute. |
Inflorescence units | 1–2-flowered; spathes green with prominent red margins, inflated, broadly lanceolate-ovate, 5.6–7 cm × 8–13 mm, unequal, outer shorter than inner, herbaceous, apex acuminate. |
1-flowered, branch unit (if present) 1-flowered; spathes covering pedicel, ovary, floral tube, and base of sepals, unequal, outer 3 cm × 10 mm, inner 6 cm × 10 mm. |
Flowers | perianth pale creamy yellow flushed with pale lavender, with conspicuous brownish purple lines; floral tube linear, 3–5 cm, somewhat dilated apically; sepals widely spreading, veined and dotted with deeper purple on claw and limb, oblanceolate, 5.5–8.4 × 1.6–2.7 cm; petals spreading, lanceolate, 5–7 × 1–2 cm, margins sinuate; ovary trigonal in cross section with groove along each angle, narrow, 1–1.5 cm; style 2–3 cm, crests narrowly semiovate or nearly linear, laciniate, 1–2 cm; stigmas rounded-truncate to 2-lobed, never triangular, margins minutely denticulate; pedicel 1–2 cm. |
perianth blue-violet; floral tube with brown striations, funnelform, 2–2.5 cm; sepals blue-violet with deeper veins, with yellow-white signal, orbicular, 7–8 × 3–4 cm, base abruptly attenuate into whitish claw with yellow-brown veining; petals mostly hidden by bases of sepals, much reduced, 1.5 × 0.3–0.5 cm, bristle absent; ovary trigonal, with shallow groove at each angle, 1.5 cm; style 3.5–4 cm, crests linear to subquadrate, 1–1.8 cm, margins sometimes incised; stigmas semicircular, margins entire; pedicel 2–3.5 cm. |
Capsules | oblong-ovoid, trigonal, somewhat beaked, 2–3 cm. |
globose to oblong, obtusely 3-angled, with rounded angles, 2.5–4 × 2 cm, rounded basally, abruptly contracted into beak apically. |
Seeds | light brown, D-shaped, oblong-ovoid, thick, finely wrinkled. |
in 1 row per locule, dark red-brown, semicircular, flattened, 6–8 mm; seed coat thick. |
2n | = 40. |
= 40. |
Iris purdyi |
Iris tridentata |
|
Phenology | Flowering Apr–Jul. | Flowering May–Jun(–Oct). |
Habitat | Open woods of redwood region | Rich, swampy, shaded places, usually along coastal plain |
Distribution |
CA
|
AL; FL; GA; LA; NC; SC; TN
|
Discussion | Iris purdyi hybridizes with I. bracteata, I. chrysophylla, I. douglasiana, I. innominata, I. macrosiphon, I. tenax, and I. tenuissima. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Iris tridentata is quite different from the other two species of ser. Tripetalae that occur in the flora. The rhizome has been described by W. R. Dykes (1913) as “almost stoloniferous,” by J. K. Small (1933), “the cord-like rootstocks are peculiar,” and by R. K. Godfrey and J. W. Wooton (1979), “clothed with coarse, strongly many-ribbed, brown, overlapping scales.” The brown scalelike leaves are produced very close together and are long enough that they appear as a small fan; as the internodes elongate, the scales are pulled apart but still overlap along the rhizome. Roots are produced from the lower side of the rhizome at the nodes. Branches may appear at any node along the narrow portion of the rhizome rather than just from the broader apex. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 26, p. 385. | FNA vol. 26, p. 380. |
Parent taxa | Iridaceae > Iris > subg. Limniris > sect. Limniris > ser. Californicae | Iridaceae > Iris > subg. Limniris > sect. Limniris > ser. Tripetalae |
Sibling taxa | ||
Synonyms | I. lansdaleana, I. macrosiphon var. purdyi | I. tripetala |
Name authority | Eastwood: Proc. Calif. Acad. Sci., ser. 3, 1: 78, plate 7, fig. 2. (1897) | Pursh: Fl. Amer. Sept. 1: 30. (1814) |
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