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, Florida and Texas. Naturalized from India. 



5. Heliotropium inundatum 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, Louisiana to California, the Antilles and tropical America. 



6. Heliotropium glabriusculum 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 cm. 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 Leavenworthii 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 

 cm. 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 polyphyllum 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 2 mm. 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 tenellum (Nutt. ) Torr. Annual, strigose. Stems 1-3 dm. tall, 

 forking above : leaves erect or ascending ; blades linear or narrowly linear-lanceolate, 

 1.5-5 cm. 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 Texan. 



10. Heliotropium conferttfolium 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, shoit-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 

 angtflately 5-lobed, about 4-5 mm. broad. 



In dry soil, southern and western Texas. 



11. Heliotropium phyllostachyum 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-lanceolate : 

 corolla white, barely surpassing the calyx ; tube slightly hispid ; lobes lanceolate, dilated 

 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- 



