1006 HELIOTROPIACEAE 
repand or undulate, narrowed into petioles or cordate: spikes mostly solitary, 1-3 dm. 
long, scorpioid at the tip, densely flowered : calyx sessile ; lobes linear to linear-lanceo- 
late, 1-2 mm. long: corolla blue ; limb 4-6 mm. broad : fruit miter-shaped, 3 mm. high, 
glabrous, sharply ribbed. 
In waste places and on roadsides, Virginia to Illinois, Floridaand Texas. Naturalized from India. 
5. Heliotropium inundàtum Sw. Annual, strigose with gray hairs. Stems 1-6 dm. 
tall, branching from the base: leaf-blades spatulate to oblong or oval, 2-4.5 mm. long, 
obtuse or acutish, undulate, narrowed into slender petioles: spikes solitary or several 
together, scorpioid, very slender, elongating: calyx sessile; lobes linear-lanceolate or 
lanceolate, 1.5-2 mm. long, acute: corolla white or whitish, about 2 mm. long; tube 
slightly surpassing the calyx-lobes ; lobes lanceolate-sagittate : fruit about 1.5 mm. broad. 
In low grounds, Louisiaifa to California, the Antilles and tropical America. 
6. Heliotropium glabriisculum A. Gray. Perennial, finely pubescent. Stems 0.5- 
1.5 dm. tall, rather copiously branched at the base, the branches closely strigose : leaf-blades 
lanceolate to oblong-lanceolate, 1-3 em. long, acute or acutish, undulate, narrowed into 
short petiole-like bases, sparingly or minutely pubescent, except on the midrib: spikes 
peduncled, solitary or two together, scorpioid, stoutish : calyx sessile; lobes lanceolate, 
1.5-2 mm. long, acute: corolla white with a green eye, 3-4 mm. long; tube longer than 
the calyx-lobes ; lobes about as long as the tube: fruit 2.5-3 mm. broad. 
In dry soil, Texas, eastern New Mexico and adjacent Mexico. 
7. Heliotropium Leavenwórthii Torr. Perennial, sometimes shrubby strigose-hir- 
sute. Stems 2-6 dm. tall, branching: leaves erect or ascending ; blades linear or linear- 
elliptic, 1-2 cm. long, acute, narrowed into short petioles or nearly sessile: racemes 2-10 
em. long: pedicels very short : calyx sparingly pubescent ; lobes lanceolate, acute, 3-4 mm. 
long: corolla golden yellow ; tube nearly cylindric, about as long as the calyx ; limb an- 
gulately 5-lobed, 7-8 mm. broad: nutlets about 1 mm. long. 
In sand and coral rock, southern Florida. 
8. Heliotropium polypbylum Lehm. Perennial from a woody root, strigose. 
Stems several together, erect or ascending, 1-2 dm. tall, more or less branched : leaves 
numerous ; blades linear-spatulate to oblong, 0.5-2 cm. long, acute, gradually or abruptly 
narrowed into short petioles: racemes scorpioid at the tip, slender: calyx-lobes lanceo- 
late or some ovate-lanceolate, about 2mm. long, acute: corolla white ; tube about as long as 
the calyx ; limb 6-8 mm. broad, angulately 5-lobed: nutlets with 2 pits in the inner faces. 
In sand, Florida. Also in tropical America. 
9. Heliotropium tenéllum (Nutt.) Torr. Annual, strigose. Stems 1-3 dm. tall, 
forking above: leaves erect or ascending; blades linear or narrowly linear-lanceolate, 
1.5-5 em. long, acute, more or less revolute, sessile or short-petioled: calyx pedicelled ; 
lobes linear, unequal, 3-6 mm. long, acute: corolla white, pubescent in the throat ; tube 
nearly cylindric, about as long as the calyx ; lobes oblong-elliptic or oval, shorter than the 
tube, obtuse: fruit 4-lobed, broader than high, 3-3.5 mm. broad, pubescent, surpassed by 
the calyx. 
In dry soil, Kentucky and Kansas to Alabama and Texas. z 
_ 10. Heliotropium confertifòlium Torr. Perennial from a shrubby base, silvery with 
a silky hirsute pubescence. Stems much branched ; branches tufted : leaves crowded, im- 
bricated ; blades linear to narrowly oblong, 5-10 mm. long, acute, revolute, short-petioled : 
spikes leafy, commonly cluster-like, not scorpioid : calyx sessile; lobes linear-lanceolate, 
2-2.5 mm. long: corolla pale purple ; tube about as long as the calyx, pubescent ; limb 
angulately 5-lobed, about 4-5 mm. broad. 
In dry soil, southern and western Texas. 
11. Heliotropium phyllostáchyum Torr. Annual, strigose-hirsute. Stems much 
branched at the base ; branches 0.5-2 dm. long, spreading, diffuse : leaves firm ; blades 
oblong or elliptic, 1-2.5 cm. long, acute or obtuse, somewhat revolute, narrowed into short 
petioles : spikes or racemes slender, loosely-flowered, leafy-bracted, one-sided : calyx 3 
mm. long at maturity; lobes unequal, lanceolate or one larger and ovate-lanceojate » 
corolla white, barely surpassing the calyx ; tube slightly hispid ; lobes lanceolate, dilate 
or produced into a tooth at the base : fruit subglobose, broader than high. 
In sandy soil, Key West and southern Arizona. 
3. EUPLOCA Nutt. 
Annual caulescent herbs, usually pubescent. Leaves alternate : blades flat. Flowers 
axillary to leaf-like bracts, scattered. Calyx-lobes 5, narrow. Corolla salverform : tub 
nearly cylindric, naked in the throat : limb 5-angled, strongly plicate in aestivation. Sta- 
