788 FLORA. 



12. PRUNELLA L. 



Perennial herbs, with petioled leaves, and rather small clustered purple or white 

 flowers, in dense bracted spikes or heads. Calyx oblong, reticulate-veined, about 

 lO-nerved, deeply 2-lipped, closed in fruit; upper lip nearly truncate, or with 3 

 short teeth; lower lip 2-cleft. Corolla-tube inflated, slightly narrowed at the 

 mouth, its limb strongly 2-lipped; upper lip entire, arched; lower lip spreading, 

 3-lobed. Filaments of the longer stamens 2-toothed at the summit, one of the teeth 

 bearing the anther, the other sterile; anthers 2-celled, the sacs divergent or 

 divaricate. Nutlets ovoid, smooth. [Origin of name doubtful; often spelled 

 Ih-iuwlla, the pre-Linnaean form.] About 5 species, of wide geographic dis- 

 tribution. 



Leaves entire or crenate. 1. P. vulgaris. 



Leaves pinnatifid or deeply incised. 2. P. laciniata. 



i. Prunella vulgaris L. Self-heal. Heal-all. (I. F. f. 3098.) Stem 

 slender, 0.5-6 dm. high. Leaves ovate, oblong or oblong-lanceolate, rather thin, 

 2-10 cm. long, the lowest commonly shorter and sometimes subcordate; spikes 

 terminal, sessile or short-peduncled, becoming 5-10 cm. long in fruit; bracts 

 broadly ovate-orbicular, cuspidate, ciliate; corolla violet, purple or sometimes 

 white, 8-12 mm. long, about twice as long as the calyx. In fields, woods and 

 waste places throughout nearly the whole of N. Am. Nat. from Europe. May 

 Oct. 



2. Prunella laciniata L. Cut-leaved Self-heal. (I. F. f. 3099. ) Similar 

 to the preceding, but the stem leaves pinnatifid, lobed, or incised, the basal ones 

 often entire or merely crenulate. Vicinity of Washington, D. C. Adventive or 

 fugitive from Europe. Summer. 



13. PHYSOSTEGIA Benth. (See Appendix.) 



Erect perennial glabrous or puberulent herbs, with large or middle-sized 

 bracted purple violet pink or white flowers in terminal spike-like racemes. Calyx 

 membranous, swollen and remaining open in fruit, faintly reticulate-veined and 

 10-nerved, equally 5 -toothed. Corolla much longer than the calyx, its tube gradu- 

 ally much enlarged upward, its limb strongly 2-lipped; upper lip concave, rounded, 

 entire; lower lip spreading, 3-lobed, the middle lobe commonly emarginate. Fila- 

 ments pubescent; anthers all alike. 2-celled, the sacs nearly parallel, the margins 

 of their valves commonly spinulose or denticulate. Nutlets ovoid triquetrous, 

 smooth. [Greek, bellows-covering, from the inflated fruiting calyx.] About 8 

 species, natives of N. Am. 



Flowers 2.5 cm. long, or more; leaves firm. 



Spike dense, many-flowered; leaf-serrations very acute. 1. P. Virginiana 



Spike loose, few-flowvred; leaf-serrations blunt. 2. P, denticulata 

 Flowers 1-1.5 cm - l° n g". leaves thin. 



Spike loose, 10-20 cm. long; leaves few and distant. 3. P. intermedia. 



Spike dense; 2-10 cm. long; stem leafy. 4. P. parvijlora. 



i. Physostegia Virginiana (L.) Benth. False Dragon-head. Obedient 

 Plant. Lion's Heart. (I. F. f. 3100.) Stem 3-12 dm. tall. Leaves lanceolate, 

 oblong-lanceolate, or linear-lanceolate, acuminate, serrate or serrulate, the upper 

 sessile 5-13 cm. long, the lowest petioled; bracts lanceolate, shorter than the calyx; 

 spikes dense, becoming 1-2 dm. long in fruit; flowering calyx campanulate or 

 somewhat turbinate, its teeth ovate, acute; fruiting calyx oblong, 8-10 mm. long, 

 the teeth much shorter than the tube; corolla pale purple or rose, often variegated 

 with white, temporarily remaining in whatever position it is placed. In moist soil, 

 Quebec to the N. W. Terr., Fla., La. and Tex. July-Sept. 



2. Physostegia denticulata (Ait.) Britton. Few-flowered Lion's Heart. 

 (I. F. f. 3101.) Stem slender, simple, or little branched, 3-6 dm. high. Leaves 

 oblong, linear-oblong, or oblanceolate, crenulate. or entire, 2-8 cm. long, the lowei 

 slender- petioled; bracts lanceolate, little longer than the fruiting pedicels; flower- 

 ing calyx oval-campanulate, its teeth acute, about one-third as long as the tube 

 fruiting calyx oblong, 0-8 mm. long; corolla rose-pink. In moist soil, Va. to Fla. 

 and Tex. june-Aug. 



