1004 HELIOTROPIACEAE 
1. Ehretia e!liptica 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 canéscens 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. Ovules pendulous. 
Fruit drupaceous or dry and separating, usually into 2 or 4 one-seeded nutlets. 
Shrubs. trees or woody twiners: fruit drupaceous. 1. TOURNEFORTIA. 
Herbs or shrubby herbs: fruit dry, separating into nutlets. 
Fruit of 4 more or less readily separating nutlets. M 
Cone of the stigma not penicil late-setose. 2. HELIOTROPIOT 
B Cone of the stigma penicillate-setose. 3. EUPLOCA. A 
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. E 
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 mw aa phaloides. 
1. Tournefortia volübilis L. A slender climbing shrubby vine, the foliage mi- 
nutely, usually rusty-pubescent. Leaf-blades ovate to oblong-lanceolate, 2-6 cm. pee 
acute or short-acuminate, entire, often oblique at the base; petioles much shorter t = 
the blades: cymes with widely spreading branches: calyx nearly sessile ; lobes ae 
late, 1 mm. long, acuminate: corolla white ; tube somewhat constricted below the m1 " 
and at the throat; lobes lanceolate or subulate, shorter than the tube, erect, acuminate : 
