MONOPETALOUS EXOGENOUS PLANTS. 421 



ing the base of the simple style. Fruit of 1-4 one-seeded 

 nutlets. Herbs. 



* Throat of the corolla naked ; nutlets not hispid. 

 t Corolla irregular. 



CoroUa funnel-shaped, unequally lobed Echium. 



tt Corolla regular. 

 Lobes of the corolla erect, acute. Nutlets smooth and stony Gnosmodiitm. 



rounded. or rugose Lithospermttm. 



somewhat fleshy Mertensia. 



convolute in the bud. Nutlets smooth Mtosotis. 



** Throat of the corolla closed with scales ; nutlets hispid. 

 Corolla funnd-formed. Nutlets depressed Ctkoglossum. 



ECHIUM, Tourn. 



Calyx 5-parted ; corolla funnel-form, unequally 5-lobed, 

 naked at the throat ; stamens 5, unequal, mostly exserted ; 

 style filiform; nutlets 4, closed at the base, uneven or 

 rough. — Herbs, with alternate leaves^ and blue or purple 

 floivers in spiked often panicled racemes. 



E. YULGAKE, L. Hispid with bristly spreading hairs; 

 stem simple, erect (l°-2° high) ; leaves linear-lanceolate, 

 sessile ; jlowers large, in short axillary racemose spikes ; 

 corolla purple, pubescent, twice as long as the lanceolate 

 calyx-teeth, shorter than the stamens and style. June- 

 August. Biennial. 



ONOSMODIUM, Michx. 



Calyx 5-parted, the lobes linear and acute ; corolla ovate- 

 tubular, naked in the throat, with five acute, counivent 

 lobes; anthers nearly sessile, sagittate, included; ovary 

 4-parted; style smooth, exserted; nutlets 1-4, ovoid, shin- 

 ing. — Erect hispid herbs, with entire somewhat ribbed ses- 

 sile leaves, and greenish floivers in a terminal bracted 

 raceme or spike. 



