Sabatia quadrangula
Sabatia arenicola
branching sabatia, four-angle sabatia, fourangle rose gentian
coast rose-gentian, sand rose-gentian
usually single, occasionally 2–several, 4-angled with wings 0.1–0.5 mm wide, 1.5–5(–7.5) dm, branching all opposite or secondary and/or tertiary occasionally alternate.
generally single, 4-angled with wings to 0.3 mm wide, 0.3–2(–3.2) dm, branching alternate or proximally occasionally opposite.
basal and cauline or only cauline present at flowering time;
basal blades spatulate-obovate;
cauline blades linear-oblong to ovate-lanceolate, 0.8–2.5(–6) cm × 3–8(–18) mm.
all cauline at flowering time;
blade elliptic to ovate or proximal occasionally obovate, 0.6–2(–2.7) cm × 2–9(–13) mm.
cymes of compact cymules;
pedicels 1–2(–4) mm.
open cymes;
pedicels 2–40(–70) mm.
5-merous;
calyx tube widely obconic to campanulate, 1.5–3(–3.5) mm, mid- and commissural veins about equally prominent, low-ridged, lobes linear-subulate or rarely wider, 2–8(–11) mm;
corolla white throughout (sometimes drying yellow or salmon) or occasionally with a yellow eye, projections of eye into corolla lobes, when present, triangular, without a contrasting border, tube 2.5–7 mm, lobes oblanceolate to narrowly spatulate-obovate, 4.5–15 × 1.5–6 mm, apex rounded to obtuse;
anthers coiling circinately.
5-merous;
calyx tube campanulate, 3.5–8.5 mm, commissural veins more prominent than midveins, ridged, lobes oblong-lanceolate to narrowly ovate-triangular, 3–20 mm;
corolla white to pink, eye white to pale yellow, projections of eye into corolla lobes oblong, without a contrasting border, tube 2–5 mm, lobes spatulate-obovate, 4–10(–13) × 2–8(–11) mm, apex obtuse to subacute;
anthers remaining straight or slightly coiling circinately.
= 32, 34.
= 28.
Sabatia quadrangula
Sabatia arenicola
The name Sabatia paniculata (Michaux) Pursh was misapplied to this species for many years but is typified by a specimen of S. difformis (R. L. Wilbur 1955).
(Discussion copyrighted by Flora of North America; reprinted with permission.)
Plants of Sabatia arenicola are densely leafy throughout. The vegetative parts are more succulent than those of the other species of Sabatia and darken upon drying (a useful character in identifying herbarium specimens). The mid-stem leaves of S. arenicola are mostly elliptic, widest near the middle, whereas those of S. campestris and S. formosa, to which it is most closely related, are mostly lanceolate to ovate, widest near the base.
Although Sabatia arenicola appears to be largely autogamous, it is now quite well isolated temporally from S. formosa. Molecular evidence indicates introgression of genetic material from S. formosa into part of the range of this species (N. B. Bell and L. J. Lester 1978).
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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