1052 LAMIACEAE 



barely 2-lipped : lobes 5, the lower one slightly larger than the others, not fringed. Stamens 

 4, nearly equal, erect : filaments all anther-bearing : anthers 2-celled. Nutlets reticulated. 

 1. Perilla frutescens ( L. ) Britton. Steins minutely pubescent, dark green or pur- 

 plish, 2-6 dm. tall, more or less branched : leaf-blades ovate or oval, 4-10 cm. long, acute 

 or abruptly acuminate, serrate or crenate-serrate, rounded or cuneate at the base : racemes 

 slender, 2-10 cm. long : pedicels 1-4 mm. long : calyx bristly, 2 mm. long becoming 6 

 mm. long, the upper lip with 3 ovate lobes, the lateral oblique, the lower lip of 2 lanceo- 

 late lobes: corolla inconspicuous, 3.5 mm. long, pubescent; lobes of upper lip and the 

 lateral lobes of the lower lip similar, the middle lobe of the lower lip larger, broadly 

 oblong, rounded at the apex : nutlets subglobose, about 1 mm. in diameter, delicately reticu- 

 lated. 



In waste places and on roadsides, New York to Illinois and Georgia. Naturalized from India. 

 Summer and fall. 



42. MESOSFHAERUM P. Br. 



Annual or perennial caulescent herbs or shrubs various in habit. Leaves opposite : 

 blades commonly toothed. Flowers in approximate or remote, often dense axillary clusters. 

 Calyx straight or oblique : tube ovoid to campanulate or tubular : lobes 5, nearly equal, 

 acute or awn-tipped. Corolla of various colors, 2-lipped : upper lip erect or spreading : 

 lower lip larger, saccate, drooping. Stamens 4, declined : filaments all anther-bearing, 

 distinct, unappendaged : anthers confidently 2-celled. Nutlets smooth, granular or slightly 

 rugulose. [Hyptis Jacq.] 



Perennial plants. 



Flower-clusters in more or less elongated raceme-like panicles. 1. M. pectinatu'm. 



Flower-cWisters aggregated in a dense head. 2. M. rugosum. 



Annual plants. 



Flower-clusters more or less remote. 



Leaf-blades cordate or truncate at the base : calyx-lobes lanceolate. 3. M. spicatum. 



Leaf-blades cuneate at the base : calyx-lobes subulate. 4. M. mutabilt. 



Flower-clusters contiguous, forming dense raceme-like panicles. 5. M. spicigerum. 



1. Mesophaerum pectinatum ( Poir. ) Kuntze. Perennial, finely pubescent. Stems 

 erect, 3-18 dm. tall, branching : leaf-blades ovate, 2-8 cm. long, acute, serrate, commonly 

 rounded or subcordate at the base, petioled : calyx minutely pubescent, 3-4 mm. long ; 

 tube slightly curved, hairy in the throat ; lobes subulate, nearly as long as the tube : cor- 

 olla hardly exceeding the calyx ; tube abruptly expanded at the throat, the upper lip of 

 2 ovate lobes, the lateral lobes of the lower lip similar to those of the upper, but smaller, 

 the middle lobe dipper-like, notched : nutlets about 1 mm. long, granular. 



In waste places and woods, Florida. Also in tropical America. Spring to fall. 



2. Mesosphaemm rugosum (L. ) Pollard. Perennial, puberulent, or glabrous below. 

 Stems erect or ascending, often tufted, 5-12 dm. tall, simple or sparingly branched : leaf- 

 blades ovate to lanceolate or linear-lanceolate, 2-8 cm. long, acute, rather remotely serrate, 

 decurrent on the petioles : heads dense, 1-1.5 cm. thick : calyx densely pubescent, 3-5 

 mm. long ; lobes lanceolate or subulate-lanceolate, shorter than the tube : corolla about 6 

 mm. long, pubescent, the upper lip of 2 rounded lobes, the lower lip with 2 spreading 

 lateral lobes and a dipper-like erose middle lobe : nutlets nearly 1.5 mm. long. [H. 

 radiate Willd.] 



In damp soil and swamps, North Carolina to Florida and Texas. Also in tropical America. Sum- 

 mer and fall. 



3. Mesosphaerum spicatum (Poir.) Small. Annual, pubescent. Stems erect, 5-15 

 dm. tall, muricate- pubescent especially on the angles, branching above : leaf-blades deltoid- 

 ovate to deltoid, 2-5 cm. long, acute or acuminate, rather finely and doubly crenate- 

 serrate, truncate to subcordate at the base, petioled : flower-clusters nearly sessile, rarely 

 contiguous : calyx becoming 5 mm. long, minutely pubescent ; lobes lanceolate but short, 

 much shorter than the tube : corolla 4-5 mm. long ; tube much surpassing the calyx, the 

 upper lip of 2 round-ovate lobes, the lower lip with 2 spreading oblong lateral lobes and a 

 dipper-shaped middle lobe : longer filaments pubescent : nutlets 1 mm. long, granular. 

 [Hyptis spicata Poir. ] 



In sandy woods, Florida and Alabama. Also in tropical America. Spring to fall. 



4. Mesosphaerum mutabile (L. C. Rich.) Kuntze. Similar to M. spicatum in 

 habit, but much less pubescent, sometimes nearly glabrous : leaf-blades ovate, sometimes 

 narrowly so, 4-8 cm. long, acute or slightly acuminate, coarsely serrate or crenate-serrate, 

 cuneate at the base, slender-petioled : flower-clusters short-peduncled : calyx becoming 4.5 

 or 5 mm. long, often finely pubescent ; lobes subulate, longer than those of M. spicatum, but 



