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Dalea bartonii (Warnock's prairie clover)
Anderson, Wynn

Dalea bartonii

Dalea bartonii Barneby

Warnock's Prairie Clover, Cox's Dalea

Fabaceae (Pea family)

Synonym(s):

USDA Symbol: DABA2

USDA Native Status: L48 (N)

"Short, slender, almost always monocephalous stems less than 2.5 dm long." (webref: 28). "Dwarf, tufted perennial herbs from stout woody roots and a greatly enlarged, knotty caudex up to 3 cm diam, glabrous to the ciliolate oriflce of the calyx, the many slender, striate dotted but not tuberculate, simple or occasionally weakly spurred stems 1.2-2.5 dm long, by anthesis leafless at base, but thence equably leafy up to the usually solitary (rarely 2-3) terminal headlike spikes." (bibref: 1812).

 

From the Image Gallery

6 photo(s) available in the Image Gallery

Plant Characteristics

Duration: Perennial
Habit: Herb
Leaf Arrangement: Alternate
Size Notes: To about 11 inches in height.
Leaf: "The foliage pallid or yellowish green, the thick-textured leaflets smooth above, multipunctate beneath; leaf-spurs 0-0.4 mm long; stipules triangular-subulate 0.2-1.2 mm long, early becoming brown and deciduous; intrapetlolular glands small, immersed; post-petiolular glands small or 0; leaves petioled, the primary cauline ones 8-20 (23) mm long, with narrowly green-margined, ventrally grooved rachis and 5-9 oblanceolate to obovate-cuneate, emarginate, folded and backwardly arched leaflets 2.5-7.5 mm long, the terminal leaflet either sessile or minutely stalked, the uppermost leaves like those of some axillary branchlets often smaller and 3-foliolate." (bibref: 1812).
Flower: "Spike... a subsessile, capitate or shortly oblong head of 5-30 flowers." (webref: 28). "Peduncles 1-6 mm long; spikes shortly 5-30-flowered, subglobose to shortly oblong, without petals 8 mm diam, the calyces spreading-ascending, the axis becoming 3-14 mm long; bracts dimorphic, the lowest persistent, ovate, 2 mm long, the (little known) interfloral ones early deciduous, papery-castaneous except for narrow membranous margins near base, up to 3 mm long; spicular bracteoles 0.2-0.5 mm long; calyx obliquely obovoid-pyriform, 3.8-4.3 mm long, glabrous externally, at base broadly obconic, gray-glaucescent, and (dry) pleated, thence castaneous and charged between the slender, immersed ribs with prominent yellow glands, these 1-seriate in the narrower panels, numerous and scattered in the broad adaxial ones, the tube 2.8-3.5 mm long, strongly oblique at oriflce, the sinus behind banner shallowly recessed but much broader than the rest, the 3 abaxial teeth narrowly triangular-subulate, 0.7-1 mm long, the ventral pair shorter, broadly deltate, all densely ciliolate and internally pilosulous with silvery hairs up to 0.2 mm long; petals white, glandless, the epistemonous ones perched at separadon of the filaments; banner 5.4 mm long, the filiform claw 3 mm, the deltate-obcordate, distally hooded blade 2.5 mm long, 3 mm wide; epistemonous petals all similar (the abaxial pair slightly larger), 3.7 mm long, the obovate blades 3 mm long, 1.5 mm wide, cuneately narrowed at base into a claw less than 1 mm long; androecium 9.5 mm long, the column 4 mm, the free filaments up to 4.5 mm long (anthers not seen); pod half-obovoid, 2. 8 mm long, the ventral suture nearly straight, the dorsal one strongly convex and slenderly keeled along the prow, the valves membranous but heavily castaneous-flecked in lower 1/3, thence firm, thinly and minutely appressed-pilosulous along the abaxial curve, densely short-barbate at apex and along base of style." (bibref: 1812).
Fruit: "Seed nearly 2 mm long." (bibref: 1812).

Bloom Information

Bloom Color: White
Bloom Time: Jul
Bloom Notes: "Petals white." (bibref: 1812).

Distribution

USA: TX
Native Distribution: Endemic to Hell's Half Acre area of Brewster County, Texas. (webref: 28).
Native Habitat: "A shortgrass, semi-desert grassland with scattered pinyon and juniper in gravelly soils on limestone hills. The elevation is about 1100 m."(webref: 28).

Web Reference

Webref 28 - NatureServe Explorer: An online encyclopedia of life (2018) NatureServe

Additional resources

USDA: Find Dalea bartonii in USDA Plants
FNA: Find Dalea bartonii in the Flora of North America (if available)
Google: Search Google for Dalea bartonii

Metadata

Record Modified: 2021-03-03
Research By: JAM

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