Amsonia hubrichtii
Amsonia peeblesii
Hubricht's bluestar
Peebles' bluestar
erect, (35–)52–130 cm, glabrous;
branches borne on distal portion of stem, much exceeding infructescence.
erect from vertical taproot, (15–)20–58(–90) cm, glabrous;
branches often borne below midpoint of stem as well as distally, uppermost often exceeding infructescence, often terminated by small inflorescences.
petiole 0–3(–4) mm, glabrous;
blades slightly heteromorphic;
stem leaf blades linear, (5–)7.5–11 cm × 2–3.2(–4.2) mm, margins entire, revolute, not ciliate, apex narrowly acute, surfaces glabrous or sparsely short-pubescent on midrib and veins adaxially;
branch leaf blades linear, 5–10.5 cm × (0.8–)1–1.8(–2.4) mm.
petiole 0–1.2 mm, glabrous;
blades moderately heteromorphic;
stem leaf blades ligulate to narrowly oblong-elliptic or narrowly lanceolate, 3.2–7.3(–9.3) cm × 3–7(–9) mm, margins entire, not (slightly) revolute, not ciliate, apex acute, surfaces glabrous;
branch leaf blades linear to very narrowly oblong or lanceolate, 4.1–6.4(–7.4) cm × 1–4(–7) mm.
sepals deltate to narrowly deltate, 0.7–1.5 mm;
corolla tube blue (to purplish), 6–8 mm, lobes blue (to white, purplish), (4.5–)5.4–7.8 mm, outer surface of corolla glabrous.
sepals narrowly deltate (subulate), (2–)3–6(–9.5) mm;
corolla tube purplish blue to greenish, darker and more bluish proximally, (13–)14–17(–19) mm, lobes white, (5–)7–9(–10) mm, outer surface of corolla glabrous.
7.5–11 × 1.6–2.2 mm.
(5–)7–11 × 1.5–2.5 mm.
pendulous or erect, 7.5–13.8 cm × 2.5–3.4 mm, apex acute, glabrous.
erect, (2–)3–7(–10) cm × (2.5–)3–4 mm, apex acuminate, glabrous.
= 22.
Amsonia hubrichtii
Amsonia peeblesii
Amsonia hubrichtii resembles A. ciliata var. filifolia but is a much larger plant, with longer, adaxially lustrous leaves, and with narrower ecological preferences. It is confined to central and western Arkansas and southeastern Oklahoma.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
Amsonia peeblesii generally resembles narrower-leaved, glabrous forms of A. palmeri. The stems of A. peeblesii are much more often branched below the midpoint, and the flowers are usually larger; the distribution of A. peeblesii is narrower and more northerly, whereas A. palmeri is largely found in southern and western portions of Arizona.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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