Flora of North America species comparison

usually 1 + 1–few rosettes.

blades obtuse to subacute, not white-margined;

basal and rosette blades spatulate-obovate to elliptic, 3–22 cm × 10–32 mm;

cauline alternate, subopposite, or distal often opposite, blades elliptic-oblanceolate.

basal and cauline, opposite or all or distal leaves subopposite or alternate.

narrow, open, often few-flowered.

thyrses or verticillasters, occasionally racemoid [flowers solitary or few].

(4- or)5-merous;

calyx 4–8 mm;

corolla bluish white to violet-blue, sometimes with darker spots, or rarely greenish white, veins darker, 7–16 mm, lobes lanceolate-oblong, apex acute;

corona low, ± fringed ridge;

openings of foveae oval to round, rims fringed all around.

4- or 5-merous;

calyx lobed nearly to base, lobes lanceolate;

corolla violet-blue or pale green to white, usually with violet-blue markings and/or suffusions [rarely brownish red], rotate or nearly so, lobes much longer than tube, entire, plicae between lobes absent;

stamens inserted near base of corolla tube, usually connected by corona consisting of low ridge from which trichomes [scales] arise between filaments;

anthers distinct;

ovary sessile [short-stipitate];

style persistent, erect, short [absent];

stigmas 2;

nectaries in [1] 2 foveae per corolla lobe, rim of openings raised [rarely scarcely so], fringed.

compressed-cylindric to ovoid.

 = [7, 8, 9, 10, 12, 13] 14.

 = 28.