FLORA OF THE DISTRICT OF COLUMBIA. 237 



133. BQRAGINACEAE. Borage Family. 



"Plants glabrous throughout. Corolla blue, about 2 cm. long 4. MERTENSIA. 



Plants hairy. 

 Uppermost leaves long-petioled, the petioles not winged, the blades mostly oval 

 and rounded at the apex; flowers very small, white, sessile in one-sided spikes. 



1. HELIOTROPIIIM. 

 Uppermost leaves sessile or on short winged petioles; flowers on long or short 

 pedicels. 

 Flowers not subtended by bracts or leaves, in naked racemes or clusters, or the 

 lowest flowers sometimes in leaf axils. 

 Leaves small, rarely 1.5 cm. wide; plants rarely more than 30 cm. high; nut- 

 lets of the fruit unarmed 5. MYOSOTIS. 



Leaves large, most of them over 2 cm. wide and often 3-10 cm. wide or even 

 larger; planls tall, usually 60-100 cm. high; fruit covered wilh barbed 



spines 2. CYNOGLOSSUM. 



Flowers all subtended by bracts, or borne in the leaf axils. 

 Stems bristly-hairy, the hairs long, stiff, usually whitish; flowers blue, more or 

 le^s irregular. 

 Corolla throat open, the stamens long-exserted; racemes short, arranged in 



a long narrow panicle 9. ECHITJM. 



Corolla throat closed by scales, the stamens included in the corolla; racemes 



mostly long, not panicled 8. LYCOPSIS. 



StemB not brislly-hairy, the hairs either appressed or spreading (then very 

 slender and soft); flowers regular. 

 Stem leaves mostly long-petioled; fruit armed with barbed prickles. 



3. LAPPTJLA. 

 Stem leaves sessile; fruit unarmed. 

 Corolla salverform, the lobes rounded; lateral veins of the leaves incon- 

 spicuous; style included 6. LITHOSPEBMUM. 



Corolla tubular, the lobes very acute; lateral veins of the leaves very 

 prominent; style long-exserted 7. ONOSMODIUM. 



1. HELIOTROPIUM L. 

 1. Heliotropium europaeum L. 



Waste ground about Alexandria. July-Sept. Native of Eur. ; naturalized in 

 the eastern U. S. 



The garden heliotropes are derived from IT. peruvianum L. and IT. corymbosum 

 Ruiz & Pav. 



2. CYNOGLOSSUM L. 



Stems leafy throughout; leaves all very acute; calyx lobes longer than the fruit; 



flowers reddish or white 1. C. officinale. 



Stems naked above; lower leaves rounded or obtuse at the apex; calyx lobes shorter 



than the fruit; flowers blue 2. C. virginianum. 



1. Cynoglossum officinale L. Hound's-tongue. 

 Fields and waste ground; frequent. May-June. Native of Eur.; widely naUiral. 



ized in N. Amer. 

 White-flowered plants occur occasionally. 



2. Cynoglossum virginianum L. Wild comfrey. 

 Woods along the upper Potomac and Rock Creek. May-June. Southeastern U. S. 



3. LAPPULA Moench. 



1. Lappula virginiana (L.) Greene. Stickseed. 



Woods and thickets; frequent. July-Aug. Eastern N. Amer. (Echinospermum 

 mrginicum Lehm . ) 



