1004 HELIOTROPIACEAE 



1. Ehretia elliptica DC. A shrub or small tree rarely 14 m. tall, with deeply fur- 

 rowed bark. Leaf-blades firm, oblong, oval or oblong-ovate, 3-5 cm. long, obtuse or acute, 

 undulate or irregularly serrate, scabrous, short-petioled : corymbs 2-6 cm. broad, pubes- 

 cent : pedicels variable, 1-10 mm. long : calyx scabro-pubescent ; lobes lanceolate, 2-2.5 

 mm. long, acute, ciliate : corolla white, 7-9 mm. broad ; tube campanulate-funnelform, 

 surpassing the calyx ; lobes rounded, spreading, shorter than the tube : stamens somewhat 

 exserted: fruit subglobose, 5-8 mm. in diameter, with two nutlets. 



In valleys and on ridges, southern and western Texas and adjacent Mexico. 



4. COLDENIA L. 



Annual or perennial diffusely branching herbs. Leaves alternate. Flowers solitary 

 in the axils, or in terminal spikes or racemes. Calyx sessile or pedicelled : tube relatively 

 short : lobes 4-5, rather narrow. Corolla usually white : tube short, naked or scaly within : 

 lobes 4-5, spreading, imbricated. Stamens 4-5, included : filaments short, adnate to the 

 corolla tube. Ovary 2-celled or rarely 4-celled by the septum-like placentae, 4-lobed : 

 styles distinct or somewhat coherent : stigmas capitate. Ovules pendulous. Drupe with 

 a thin fleshy or rather dry exocarp and a stone separating into 4 nutlets. 



1. Coldenia canescens DC. Perennial from a woody base. Foliage whitish tomen- 

 tose or somewhat silky : stems branched at the base, the branches spreading or prostrate, 

 1-4 dm. long, forking : leaves clustered ; blades elliptic or oval, sometimes broadest above 

 or below the middle, acute, entire, short-petioled : clusters axillary, few-flowered, or flowers 

 solitary : calyx-lobes narrowly lanceolate, acute, 3-4 mm. long : corolla about 4 mm. broad ; 

 tube funnelform, surpassing the calyx ; lobes suborbicular, usually broader than high, 

 spreading, somewhat crisped: stamens included : fruit spheroidal, 2.5-3 mm. in diameter 

 with 4 nutlets, these smooth on the back, slightly rugose on the faces. 



On plains and prairies, Texas to Arizona and adjacent Mexico. 



FAMILY 9. HELIOTROPIACEAE Small. HELIOTROPE FAMILY. 



Herbs, shrubs or woody vines. Leaves alternate, without stipules : blades 

 entire or rarely toothed. Flowers perfect, mainly in scorpioid spikes or racemes. 

 Calyx of 5 partially united or nearly distinct sepals. Corolla of 5 partially 

 united petals, campanulate, funnelform or salverform. Androecium of 5 stamens 

 with the filaments wholly or almost wholly adnate to the corolla tube. Gynoe- 

 cium of 2-4 united carpels. Ovary 2-4-celled, often somewhat 4-lobed. Styles 

 united. Stigma annular, surmounted by a 2-lobed appendage. Ovujes pendulous. 

 Fruit drupaceous or dry and separating, usually into 2 or 4 one-seeded nutlets. 



Shrubs, trees or woody twiners : fruit drupaceous. 1. TOVRNEFORTIA. 

 Herbs or shrubby herbs : fruit dry, separating into nutlets. 

 Fruit of 4 more or less readily separating nutlets. 



Cone of the stigma not penicillate-setose. 2. HELIOTROPH >!. 



Cone of the stigma penicillate-setose. 3. EUPLOCA. 



Fruit of 2 completely 2-celled nutlets, or sometimes 1-celled and 1-seeded. 4. COCHRANEA. 



1. TOURNEFORTIA L. 



Shrubs, trees or vines, with often densely pubescent foliage. Leaves alternate : blades 

 various. Flowers inconspicuous, in simple or dichotomous cymes. Calyx persistent : lobes 

 5, narrow, imbricated or distant. Corolla white or pale : tube cylindric, or sometimes di- 

 lated at the point where the filaments become free : lobes 5, spreading, imbricated or in- 

 duplicate. Stamens 5, included. Ovary 4-celled : styles united. Ovules pendulous from 

 lateral attachments. Drupe with a thin fleshy or corky exocarp and a stone of 4 or fewer 

 distinct or united nutlets. 



A shrubby vine : foliage minutely pubescent : corolla-lobes lanceolate or subulate. 1. T. volubilis. 

 A fleshy shrub : foliage densely white silky-tomentose : corolla-lobes ovate or oblong-ovate. 



2. T. gnaphaloidcs. 



1. Tournefortia volubilis L. A slender climbing shrubby vine, the foliage mi- 

 nutely, usually rusty-pubescent. Leaf-blades ovate to oblong-lanceolate, 2-6 cm. long, 

 acute or short-acuminate, entire, often oblique at the base ; petioles much shorter than 

 the blades : cymes with widely spreading branches : calyx nearly sessile ; lobes lanceo- 

 late, 1 mm. long, acuminate : corolla white ; tube somewhat constricted below the middle 

 and at the throat; lobes lanceolate or subulate, shorter than the tube, erect, acuminate: 



