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3. MITREOLA L. (MITREWORT.) 
Annual smooth herbs, with small stipules between the leaves, small 
white flowers spiked along one side of the branches of a terminal peti- 
oled cyme, 5-parted calyx, somewhat funnelform 5-lobed corolla little 
larger than the calyx, 5 included stamens, 2 short styles converging 
and united above by a common stigma, and an exserted strongly 2-horned 
or mitre-shaped pod opening down the inner side of each horn. 
1. M. petiolata Torr. & Gray. Leaves thin, oblong-lanceolate, petioled.—Damp 
soil, extending from the Gulf States through Texas to Mexico. 
4. POLYPREMUM L. 
A smooth diffuse much-branched small annual, with narrowly linear 
or awl-shaped leaves connected at base by a slight stipular line, incon- 
spicuous white flowers solitary and sessile in the forks and at the ends 
of branches, 4-parted calyx with awl-shaped divisions from a broad 
scarious-margined base, almost wheel-shaped corolla not longer than 
calyx and bearded in the throat, 4 very short stamens with globular 
anthers, single very short style with entire stigma, and ovoid 2-celled 
loculicidal many-seeded pod notched at apex. 
1. P. procumbens L.—Sandy soil, extending from the Atlantic region, through 
Texas to Mexico. 
5. BUDDLEIA Houston. 
Mostly shrubs, with canescent or tomentose stellate down, leaves 
sometimes dentate and with petioles connected by a transverse stipular 
line or more evident stipules, commonly small flowers crowded into 
sapitate clusters which are variously disposed, 4-toothed campanulate 
calyx, rotate-campanulate corolla with ovate or orbicular lobes, 
4 anthers sessile or nearly so in throat or tube of corolla, and globose 
or oblong septicidal pod. 
* Flowers in comparatively loose and very numerous clusters in an ample and naked ter- 
minal panicle. 
1. B. Humboldtiana Rem. & Schult. Minutely ferrugineous-tomentose: leaves 
oblong or ovate-lanceolate, acuminate, denticulate, 7.5 cm. long, rounded at base, 
rather long-petioled, copiously pinnately-veined: flowers 3 mm. long.—Borders of 
southwestern Texas. 
* * Flowers in numerous and small dense pedunculate heads, in a virgate raceme. 
2. B. racemosa Torr. Stems loosely branching, nearly glabrous: leaves from 
ovate-oblong to oblong-lanceolate with a truncate or obscurely hastate base, irregu- 
larly crenate-dentate, mostly obtuse, 5 to 10 cm. long, short-petioled, green and 
glabrous above, puberulent-canescent beneath: raceme of heads from 1 to3 dm. long: 
heads about 6 mm. broad: corolla little exceeding the tomentulose calyx.—Rocky 
banks, western Texas. Along the San Pedro occurs var. INCANA Torr., with leaves 
barely 2.5 cm. long and fulvous-canescent-tomentose beneath. 
** * Flowers in solitary or geminate heads or capitate clusters: leaves, branches, and 
heads densely soft-tomentose throughout. 
3. B. marrubiifolia Benth. Canescent or ferrugineous: leaves obovate or oval 
with cuneate base, arcuate, about 12 mm. long, short-petioled, the dense tomentum 
