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 frutéscens (L.) Britton. Stems 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 
ear rounded at the apex : nutlets subglobose, about 1 mm. in diameter, delicately reticu- 
ated. 
In waste places and on roadsides, New York to Illinois and Georgia. Naturalized from India. 
Summer and fall. 
42. MESOSPHAERUM 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 confluently 2-celled. Nutlets smooth, granular or slightly 
rugulose. [Hyptis Jacq.] 
Perennial plants, A 
Flower-clusters in more or less elongated raceme-like panicles. 1. M. pectinatum. 
Flower-clusters 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. mutabile. 
Flower-clusters contiguous, forming dense raceme-like panicles. 9. M. spicigerum. 
1. Mesophaerum pectinàtum (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. Mesosphaerum rugósum (L.) Pollard. Perennial, puberulent, or glabrous nr 
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 rur 
decurrent on the petioles: heads dense, 1-1.5 cm. thick: calyx densely pubescent, 22 
mm. long; lobes lanceolate or subulate-lanceolate, shorter than the tube : corolla about 
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. 
radiata Willd. } 
In damp soil and swamps, North Carolina to Florida and Texas. Also in tropical America. Sum- 
mer and fall. 
3. Mesosphaerum spicàtum (Poir.) Small. Annual, pubescent. Stems ee 
dm. tall, muricate-pubescent especially on the angles, branching above : leaf-blades de gend 
ovate to deltoid, 2-5 cm. long, acute or acuminate, rather finely and doubly d 
serrate, truncate to subcordate at the base, petioled : flower-clusters nearly sessile, pubs 
contiguous: calyx becoming 5 mm. long, minutely pubescent ; lobes lanceolate A: : the 
much shorter than the tube: corolla 4-5 mm. long; tube much surpassing the eae d a 
upper np of 2 round-ovate lobes, the lower lip with 2 spreading oblong lateral lobes ene 
dipper-shaped middle lobe: longer filaments pubescent: nutlets 1 mm. long, gran"? 
[Hyptis spicata Poir. ] 
In sandy woods, Florida and Alabama. Also in tropical America. Spring to fall. : : 
4. Mesosphaerum mutábile (L. C. Rich.) Kuntze. Similar to M. yersus 
habit, but much less pubescent, sometimes nearly glabrous: leaf-blades ovate, geese 
narrowly so, 4-8 cm. long, acute or slightly acuminate, coarsely serrate or d 5 
cuneate at the base, slender-petioled : flower-clusters short-peduncled : calyx gib sicud bit 
or 5 mm. long, often finely pubescent ; lobes subulate, longer than those of M. spwatum, 
