GENUS i. 



BORAGE FAMILY. 



75 



5. Heliotropium convolvulaceum (Nutt.) A. Gray. 



Fig. 3506. 



Enploca convolvulacea Nutt. Trans. Am. Phil. Soc. (II.) 



5: 189. 1833-37. 

 H. convolvulaceum A. Gray, Mem. Am. Acad. 6 : 403. 



1857- 



Annual, strigose-canescent, usually much branched, 

 6'-is' high, the branches ascending. Leaves oblong, 

 ovate, or lanceolate, entire, short-petioled, obtuse or 

 acute at the apex, narrowed at the base, -i long; 

 flowers numerous, fragrant, very short-peduncled, 

 terminal and lateral, mostly solitary and opposite the 

 leaves ; calyx-segments lanceolate, acuminate, equal ; 

 corolla white, strigose, 8"-io" long, about 6" broad, 

 its tube narrowed at the throat, longer than the calyx 

 and the angulate-lobed limb; anthers inserted on the 

 tube of the corolla, slightly cohering by their tips; 

 style filiform; stigma with a tuft of bristly hairs; 

 fruit 2-lobed, pubescent, each lobe splitting into 2 

 i-seeded nutlets. 



In dry sandy soil, Nebraska to Texas, Utah and 

 Mexico. July-Sept. 



Bindweed Heliotrope. 



6. Heliotropium indicum L. Indian Helio- 

 trope. Fig. 3507. 



Heliotropium indicum L. Sp. PI. 134. 1753. 



Annual, more or less hirsute 'or hispid ; stem com- 

 monly branched, i-3 high. Leaves ovate or oval, 

 obtuse or acute at the apex, obtuse rounded or sub- 

 cordate at the base, 2'-6' long, i'-3i' wide, repand or 

 undulate, borne on margined petioles \'-2.\' long; 

 flowers blue, 2"-3" broad, sessile in terminal dense 

 bractless usually solitary scorpioid spikes which be- 

 come 3'-6' long in fruit; calyx-segments lanceolate, 

 acute, shorter than the strigose corolla-tube; style 

 very short, deciduous ; fruit deeply 2-lobed, glabrous, 

 the lobes divergent, each finally splitting into 2 

 nutlets, each of which is ribbed on the back. 



In waste places, North Carolina to Kentucky, Illinois, 

 Missouri, Florida and Texas. Naturalized from India. 

 Also in ballast about the northern seaports. Widely 

 distributed in warm regions as a weed. Turnsole. 

 May-Nov. 



2. CYNOGLOSSUM [Tourn.] L. Sp. PL 134. i;53- 



Hirsute or hispid (rarely glabrous) mostly tall herbs, with alternate entire leaves, the 

 basal long-petioled, and purple blue or white flowers in panicled, more or less scorpioid 

 racemes. Calyx 5-cleft or 5-parted, enlarged and spreading or reflexed in fruit. Corolla 

 funnelform or salverform, the tube short, the throat closed by 5 scales opposite the imbri- 

 cated rounded lobes. Stamens included; filaments short; anthers ovate or oblong. Ovary 

 deeply 4-lobed, separating into 4 diverging nutlets in fruit ; style mostly slender. Nutlets 

 oblique, flat or convex above, attached laterally to the convex or conic receptacle, covered 

 with short barbed prickles. [Greek, dog's tongue.] 



About 75 species of wide geographic distribution. Besides the following, some 3 others occur 

 in western North America. Type species : Cynoglossnm officinale L. 



Stem leafy to the top ; flowers reddish, purple or white ; nutlets flat. 

 Stem leafless above ; flowers blue ; nutlets convex. 



Flowers about 5" broad ; nutlets about 4" long. 



Flowers about 3^" broad ; nutlets about 2 l / 2 " long. 



1. C. officinale. 



2. C. virginianum. 



3. C. bore ale. 



