Lachnostoma parviflorum Torr.

Description

Latin diagnosis: Lachnostoma? parviflora (n. sp.): humifusum, pilosum; foliis ovatis vel orbiculato-ovatis acutis brevi-petiolatis; pedunculis folio multo-longioribus; floribus primo umbellatis deinde racemosis; corolla rotata, laciniis ovatis; corona stam. phyllis 10 biseriatis, 5 exterioribus alte bifidis laciniis acuminatis, 5 interioribus subulatis utrisque gynostegio longioribus; folliculis ovato-oblongis spinis innocuis villosis dense onustis.

Additional text from protologue: San Pedro Creek, western Texas; Wright, (No. 1673.) Table-land between Ringgold Barracks and Laredo, on the lower Rio Grande, June-July; Schott. Root tuberous. Stem clothed with a gray spreading pubescence, branching from the base; the branches 8-12 inches long. Leaves varying narrowly to broadly ovate, about three-fourths of an inch long, usually waved and often crisped on the margin. Peduncles axillary and subterminal at first only a little longer than the leaves, but in fruit twice or thrice longer. Umbels or racemes 5-10-flowered. Corolla about 2-1/2 lines in diameter, purplish. Stamineal crown consisting of 10 distinct leaflets in a double series; the 5 exterior cleft about halfway down, the points curved over the stigma; the 5 interior subulate, arising from the base of the exterior leaflets, which they considerably exceed in length, and are likewise curved over the stigma. Gynostegium sessile. Pollen-masses nearly orbicular. Pods 2-3 inches long, densely covered with short thick rather fleshy processes. This plant can scarcely be referred to any of Decaisne's genera, but I am unwilling to propose a new genus for its reception while my knowledge of the Mexican Asclepiadaceae is so imperfect.

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