210 KEY AND FLORA 



I. SCUTELLARIA L. 



Mostly slender herbs, not aromatic. Flowers solitary or in 

 pairs, axillary or in terminal spikes or racemes. Calyx bell- 

 shaped, 2-lipped, the upper part swollen into a helmet-shaped 

 pouch; mouth of the calyx closed after flowering. Corolla 

 tube long, naked inside. Stamens 4, the anthers meeting in 

 pairs, hairy-fringed. Style with a very short upper lobe. 

 [The species here described are not the commonest ones, but 

 most of the others grow in damp soil and bloom later.] 



1. S. serrata Andr. SKULLCAP. Stem not much branched, 1-3 ft. 

 high. Stem leaves serrate, taper-pointed at both ends, ovate or nearly 

 so. Racemes single, loose. Calyx rather hairy. Corolla 1 in. long, 

 the lips of equal length. Woods. 



2. S. piloea Michx. HAIRY SKULLCAP. Stem more or less hairy, 

 not much if at all branched, 1-3 ft. high. Leaves a few distant pairs, 

 diamond-ovate, oblong-ovate, or roundish-ovate, scalloped, obtuse, 

 the lower heart-shaped or nearly truncate at the base, with long 

 petioles. Racemes short, few-flowered. Corolla \ in. long; tube 

 whitish, lips blue, the lower one rather shorter. Open woodlands 

 and dry soil. 



3. S. integrifolia L. LARGE-FLOWERED SKULLCAP. Stem covered 

 with fine, grayish down, usually unbranched, 1-2 ft. high. Leaves 

 lance-oblong or nearly linear, mostly entire, obtuse, with very short 

 petioles. Corolla 1 in. long, tube pale, lips large and spreading, blue. 

 Dry ground. 



4. S. parvula Michx. SMALL SKULLCAP. Perennial with necklace- 

 like tuber-bearing rootstocks. Stems slender, minutely downy, 3-12 

 in. long, erect or spreading. Leaves varying from ovate to lanceo- 

 late, or the lower nearly round. Flowers solitary in the axils of the 

 upper leaves. Corolla \-\ in. long, violet, downy. In moist, sandy soil. 



II. MARRUBIUM L. 



Perennial, downy, or woolly herbs. Whorls of flowers axil- 

 lary ; flowers small ; bracts leaf-like. Calyx tubular, 5-10- 

 toothed ; teeth somewhat spiny. Corolla short ; upper lip erect, 

 lower spreading, 3-cleft, the middle lobe broadest. Stamens 4, 

 not projecting. Lobes of the stigma short and blunt. 



1. M. vulgare L. HOREHOUND. Stems somewhat reclining, stout, 

 branching, leafy, 1-1^ ft. high. Leaves broadly ovate, heart-shaped 

 or wedge-shaped at the base, scalloped, leathery and wrinkled. Whorls 



