KEY TO TEXAS SPECIES

1. Plants of east Texas, perhaps cultivated A. scrophulariifolia

1. Plants of trans-Pecos, native species (2)

2. Flowers loosely arranged in rather open spike-like cymes, the inflorescence 4-6 cm across; El Paso and Hudspeth counties A. cana

2. Flowers densely arranged in narrow spikes 1-2 cm across; not known from above counties (3)

3. Corollas purplish; leaves deltoid or subdeltoid, about as wide as long A. pallidiflora

3. Corollas white; leaves narrowly ovate (in outline), 2-3 times as long as wide A. micrantha

Descriptions

AGASTACHE CANA (Hook.) Woot. & Standl., Contr. U.S. Natl. Herb. 16:166. 1913.
BIG-FLOWERED AGASTACHE
Cedronella cana  Hook.

Known only from westernmost trans-Pecos and closely adjacent New Mexico, 1400-1800 m; flowering Jun-Aug.

This taxon was first collected by Charles Wright at Hueco Tanks, El Paso Co., Texas in Oct of 1849 and subsequently published (1851) by W.J. Hooker of Kew Gardens, England. A fine colored illustration was published with the original description (Curtis' Bot. Mag. 77: Plate 4618. 1851).

Named for its minute vestiture of short white hairs.


AGASTACHE MICRANTHA (A. Gray) Woot. & Standl., Contr. U.S. Natl. Herb. 16:168. 1913
SMALL-FLOWERED AGASTACHE
Cedronella micrantha  A. Gray

Southwestern U.S.A. from western Texas to Arizona southwards to southern Durango, Mexico, 1600-2300 m; Aug.-Oct.

This taxon was first collected in Jeff Davis Co. by Charles Wright in Aug of 1849 and subsequently described by Asa Gray in 1850. Sanders (1987) recognized two regional varieties in the species; ours belongs to the typical var. MICRANTHA.


AGASTACHE PALLIDIFLORA (Heller) Rydb., Bull. Torr. Bot. Club 33:150. 1906.
HAVARD'S AGASTACHE
Agastache pallidiflora  subsp. havardii  (A. Gray) Lint & Epling
Agastache pallidiflora  var. havardii  (A. Gray) Shinners
Cedronella breviflora  var. havardii  A. Gray

Southwestern U.S.A. from western Texas to Arizona and closely adjacent Mexico, 1800-2500 m; Jul-Oct.

Sanders (1987) recognized 4 varieties under this species, distributed among two subspecies. Our material belongs to the var. HAVARDII (A. Gray) R. Sanders. It was first collected in the Chisos Mts. (Brewster Co.) by Havard in Aug 1883.

Named for its pallid or pale purplish corollas.


AGASTACHE SCROPHULARIIFOLIA (Willd.) Ktze., Rev. Gen. 511. 1891.

This species is perhaps not native to the state; it is known to us by a single collection from the "Border of Woods," Ft. Worth (Tarrant Co.) where collected by Albert Ruth in 1909; it has not been subsequently collected, to our knowledge, and was not accounted for by Correll and Johnston (1970).

Named for the resemblance of its leaves to those of the genus Scrophularia  (Scrophulariaceae).

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