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4. HYDROLEA L. 
Herbs or scarcely shrubby, growing in water or wet places, with en- 
tire leaves (often with axillary spines), clustered blue flowers, 5-parted 
calyx, short-campanulate or almost rotate 5-cleft corolla, filaments 
dilated at base, 2 distinct styles, globular 2-celled thin-walled pod with 
very large and fleshy many-seeded placenta (septicidal or bursting irreg- 
ularly, leaving the seeds on the axis), and minute striate-ribbed seeds. 
1. H. affinis Gray. More or less spiny, glabrous throughout: stems ascending: 
leaves lanceolate, somewhat petioled, 4 to 12.5 em. long: flowers in small axillary 
leafy-bracted clusters: sepals ovate.—Extending into Texas from the Mississippi 
Valley States. 
2. H. ovata Nutt. Spiny, minutely soft-pubescent and above slightly hirsute: 
stems 3 to 6 dm, high, paniculately branched above: leaves ovate or ovate-lanceo- 
late, 16 to 40 mm. long: flowers clustered at end of branches: sepals lanceolate, 
very Villous-hirsute.—Margins of ponds, extending from Arkansas and western Lou- 
isiana through Texas to the tropics. 
BORAGINEA. (BoRAGE FAMILy.) 
Chiefly rough-hairy herbs, with alternate entire leaves, flowers mostly 
imitating a 1-sided spike or raceme, 5-parted calyx, regular 5-lobed 
corolla, 5 stamens inserted on its tube, a single style, and a usually 
deeply 4-lobed ovary forming in fruit 4 seed-like 1-seeded nutlets or 
separating into two 2-seeded or four 1-seeded nutlets. 
* Ovary undivided (or only laterally 4-lobed) and surmounted by the style. 
+ Styles twice bifid: fruit drupaceous: trees or shrubs. 
1, Cordia, Corolla funnelform or salverform: stigmas clavate or capitate. 
+ + Styles once bifid or 2-parted: trees, shrubs, or low herbs. 
2. Ehretia. Corolla from short-funnelform to rotate: fruit drupaceous: trees or 
shrubs. 
3, Coldenia, Corolla short-funnelform or nearly salverform: fruit dry: herba- 
ceous or suffruticulose. 
+ + + Style entire (sometimes wanting): inflorescence more or less scorpioid, 
4, Tournefortia. Fruit drupaceous: shrubs or woody twiners: otherwise as in 
no, 5. 
5, Heliotropium. Corolla salverform: stamens included: fruit dry: low herbs 
or undershrubs. 
** Ovary deeply 4-parted, forming as many separate 1-seeded nutlets in fruit; style 
rising from the center between them. 
+ Nutlets armed, attached laterally: corolla short, closed by 5 scales. 
6. Hshinospermum,. Nutlets erect or ascending, the margin or back armed with 
barbed prickles, 
+ + Nutlets not armed, attached more or less laterally. 
7. Krynitzkia. Corolla short, white, with closed throat: nutlets attached along 
the inner angle. 
+ + + Nutlets not armed, attached by the very base, ovoid, mostly smooth and 
shining. 
8. Myosotis. Corolla short salverform to funnelform, its lobes rounded, and throat 
crested, 
