Bulbs ovoid, 1.6-2.5 × 1.3-2.4 cm, 0.8-1.6 times taller than long, 2 years´ growth evident, newer bearing prominent basal leaves, older with abscission scars; scales few, loose, unsegmented or 2-segmented, longest 1-1.8 cm; stem roots usually present, often numerous. Stems to 0.9 m. Buds rounded in cross section. Leaves scattered, ascending, distal appressed, 1.8-8.2 × 0.2-1.2 cm, 3.1-10.5 times longer than wide; blade narrowly elliptic, sometimes linear or slightly oblanceolate, margins not undulate, apex acute, acuminate especially in distal leaves; veins and margins ± smooth abaxially. Inflorescences occasionally umbellate, 1(-3)-flowered. Flowers erect, not fragrant; perianth widely campanulate; sepals and petals recurved 2/5-1/2 along length from base, crimson or sometimes pink, distinctly clawed, apex very narrowly acute, nectar guides above claws yellow to pale yellow and spotted maroon or magenta, ± equal; sepals not ridged abaxially, 8.2-12 × 1.2-1.9 cm; petals at proximal widest point much wider than sepals, 7.6-11.1 × 1.8-3.4 cm; stamens moderately exserted; filaments ± parallel to style, barely spreading, diverging 0°-12° from axis, often purple at base; anthers variously colored tan-orange, brown, peachy magenta, or pale greenish, 0.4-1.6 cm; pollen burnt orange or dark tan; pistil 7.6-10.5 cm; ovary 1.4-3.5 cm; style pale green, sometimes darker distally; pedicel 1.8-9.5 cm. Capsules often ridged along valve margins, 2.2-5.3 × 0.8-1.6 cm, 1.7-3.8 times longer than wide. Seeds not counted. 2n = 24. Flowering late summer--fall (late Jun--Oct) in most of range, sporadically spring and fall in peninsular Florida. Wet pine flatwoods and savannas, especially in pitcher plant (Sarracenia) bogs with Sphagnum; 0--200 m; Ala., Fla., Ga., La., Miss., N.C., S.C., Va. The pine lily´s flower is the largest of any North American lily and one of the largest among our native monocots. In small plants it dwarfs and sometimes topples the slender stem. Leaves are small and relatively few and the bulb is petite, and thus resource limitation in smaller plants undoubtedly contributes to the wide range of fruit sizes within populations. In other North American members of the genus, small plants produce one or a few capsules, but typically these approach normal size. Lilium catesbaei subsp. asprellum Wherry and L. catesbaei var. longii Fernald have been proposed to account for individuals with leaves concentrated toward the middle of the stem or somewhat wide and lacking basal leaves, respectively. These variants are not emphasized here since both are based primarily on vegetative features that vary greatly in most lilies. Isotypes of var. longii are unremarkable, though with somewhat wide leaves, and the broadly overlapping distribution of this variety with nominate populations (A. E. Radford et al. 1968) strongly suggests that such differences are primarily environmentally induced. Variety longii was described from Virginia, and Fernald´s observation that these northern plants lack basal leaves-which I have not investigated in the field-is unsurprising in those colder climates, and best considered in terms of the normal variation within a fairly wide-ranging species. Although it is not yet rare, widespread alteration of native longleaf pine (Pinus palustris Miller) and slash pine (P. elliottii Engelmann) savanna, especially conversion to even-age pine plantations, is making steady inroads on populations of this most beautiful lily. It is adapted to frequent fires, and their suppression may contribute to this decline. Lilium catesbaei is pollinated primarily by the palamedes swallowtail [Papilio palamedes (Drury), family Papilionidae], the only swallowtail that is widely endemic to this lily´s coastal plain habitat. Spicebush swallowtails (P. troilus Linnaeus) visit the pine lily less frequently, and their smaller size suggests that they are less effective pollinators than the larger palamedes.
Bulb 1-3 cm, composed of narrow scales; cauline lvs all alternate, erect or appressed, linear or linear-oblong, the lower to 8 cm, the upper progressively smaller; fl solitary, erect, tep conspicuously clawed, the blade red-purple, becoming yellow (or white) and purple-spotted toward the base; fr 3 cm; 2n=24. Wet pinelands and bogs; se. Va. to Fla. and La. Our plants are var. longii Fernald: bulb-scales without prolonged lf-like tips; cauline lvs linear-oblong, acute; tep 7-10 נ2-3.5 cm, the blade twice as long as the claw.
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.