Flora of North America species comparison

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Agalinis pulchella

Agalinis navasotensis

beautiful false foxglove, purple gerardia, St. Mark's false foxglove

Navasota false foxglove
Stems

branched, 50–120 cm;

branches spreading-ascending, quadrangular-ridged, scabrous.

branched, 25–80 cm;

branches spreading-ascending, nearly terete proximally, obtusely quadrangular-ridged distally, glabrous or scabridulous distally.
Leaves

spreading-ascending;

blade filiform, 16–40 x 0.4–1 mm, margins entire, midvein harshly scabrous, adaxial surface scabrous;

axillary fascicles: length 1/2–1 times subtending leaves.

proximal to mid reflexed or recurved, distal spreading;

blade filiform, (11–)17–30(–40) x 0.5–1.2 mm, not fleshy, margins entire, siliceous, abaxial midvein scabridulous, adaxial surface scabridulous;

axillary fascicles absent.
Inflorescences

racemiform-paniculiform, flowers 1 per node, some flowers pseudoterminal;

bracts shorter than pedicels.

racemiform-paniculate, flowers 1 or 2 per node;

bracts both longer and shorter than, or shorter than, pedicels.
Pedicels

spreading-ascending, 12–50 mm, scabrous.

ascending-spreading, (2–)6–25 mm, scabridulous proximally or glabrous.
Flowers

calyx hemispheric, tube 3–4(–5) mm, glaucous, lobes erect, subulate, 0.1–0.6 mm;

corolla dark pink to rose, with 2 yellow lines and purple spots in abaxial throat, 22–33 mm, throat sparsely pilose externally and glabrous within across bases of adaxial lobes, sparsely villous at sinus, lobes: abaxial reflexed-spreading, adaxial spreading, 6–12 mm, equal, glabrous externally;

proximal anthers parallel to filaments, distal perpendicular to filaments, pollen sacs 2.5–3.8 mm;

style strongly exserted, 9–18 mm.

calyx funnelform-obconic, tube 2.2–4.6 mm, glabrous, lobes triangular-subulate to subulate, 0.5–1.5 mm;

corolla pink to rose, with 2 yellow lines and red spots in abaxial throat, 15–24 mm, throat pilose externally and glabrous within across bases of adaxial lobes, sparsely villous at sinus, lobes spreading, 5–7 mm, equal, glabrous externally;

proximal anthers parallel to filaments, distal perpendicular to filaments, pollen sacs 2–3.2 mm;

style exserted, 11–15 mm.
Capsules

globular, 4–6 mm.

ovoid to obovoid-oblong, (4–)6–7 mm.
Seeds

black, 0.5–0.8 mm.

dark brown, 0.8–2.3 mm.
2n

= 26.

= 26.

Agalinis pulchella

Agalinis navasotensis
Phenology Flowering Sep–early Oct. Flowering Sep–Oct.
Habitat Dry, open pine savannas, open pine-oak sandhills, dry upslope areas of wiregrass-dominated mesic prairies, chalky glades or roadsides, dry sandy or clay roadsides beside existing or remnant savannas. Rocky prairie remnants on sandstone outcrops, sandy clay soils of longleaf pine savannas.
Elevation 0–100 m. (0–300 ft.) 90–100 m. (300–300 ft.)
Distribution
from FNA
AL; FL; GA; LA; MS; TX
[WildflowerSearch map]
[BONAP county map]
from FNA
TX
[BONAP county map]
Discussion

Agalinis pulchella is an uncommon species in the easternmost area of its range and is common only westward in southeastern Texas.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Agalinis navasotensis is known from Grimes and Tyler counties in eastern Texas; it should be looked for elsewhere in eastern Texas and northwestern Louisiana. Agalinis navasotensis differs from A. caddoensis by subtleties of its calyx shape, leaf length, corolla length, inflorescence form, and offset pollen sacs. Additional collections may show that A. navasotensis and the morphologically similar, but poorly known, A. caddoensis of western Louisiana are conspecific.

Agalinis navasotensis is in the Center for Plant Conservation’s National Collection of Endangered Plants.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 17, p. 551. FNA vol. 17, p. 548.
Parent taxa Orobanchaceae > Agalinis Orobanchaceae > Agalinis
Sibling taxa
A. aphylla, A. aspera, A. auriculata, A. caddoensis, A. calycina, A. decemloba, A. densiflora, A. divaricata, A. edwardsiana, A. fasciculata, A. filicaulis, A. filifolia, A. flexicaulis, A. gattingeri, A. georgiana, A. harperi, A. heterophylla, A. homalantha, A. laxa, A. linifolia, A. maritima, A. navasotensis, A. neoscotica, A. obtusifolia, A. oligophylla, A. plukenetii, A. purpurea, A. setacea, A. skinneriana, A. strictifolia, A. tenella, A. tenuifolia, A. viridis
A. aphylla, A. aspera, A. auriculata, A. caddoensis, A. calycina, A. decemloba, A. densiflora, A. divaricata, A. edwardsiana, A. fasciculata, A. filicaulis, A. filifolia, A. flexicaulis, A. gattingeri, A. georgiana, A. harperi, A. heterophylla, A. homalantha, A. laxa, A. linifolia, A. maritima, A. neoscotica, A. obtusifolia, A. oligophylla, A. plukenetii, A. pulchella, A. purpurea, A. setacea, A. skinneriana, A. strictifolia, A. tenella, A. tenuifolia, A. viridis
Synonyms Gerardia pulcherrima
Name authority Pennell: Bull. Torrey Bot. Club 40: 428. (1913) Dubrule & Canne-Hilliker: Sida 15: 426, figs. 1–7. (1993)
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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