1012 YERBENACEAE 



ing : leaves opposite, commonly clustered in the axils ; blades linear-cuneate, 1-3 m. long r 

 incisely 2-8-toothed above the middle, nearly nerveless except the prominent midrib, ses- 

 sile : peduncles shorter than the subtending leaves or slightly longer : bracts 3-4 mm. 

 long, apiculate, with wing-like shoulders at top : calyx 3 mm. long, pubescent : corolla 

 purplish or whitish, 4 mm. long, glabrous ; tube slightly surpassing the calyx ; lower lip 

 of limb about as long as the tube : fruit oval, about 1.5 mm. long. [Lippia cuneifolia Torr. ] 

 In dry soil, Wyoming to Nebraska, south to Texas and Arizona. 



2. Phyla in cisa Small. Foliage strigillose-canescent. Stems branching at the base ; 

 branches spreading or prostrate, often creeping, simple or branched : leaves opposite, some 

 often clustered in the axils; blades linear-cuneate, 1-3.5 cm. long, incisely 2-8-toothed 

 above the middle, nerveless except the prominent midrib : peduncles at least twice as long as 

 the subtending bracts : heads subglobose, becoming cylindric, 1-2 cm. long : bracts rhom- 

 boidal, 2 mm. long, acute, ciliolate : calyx barely 2 mm. long, puberulent : corolla white 

 or bluish, 2.5-3 mm. long ; tube becoming funnelform ; lower lip with a middle lobe some- 

 what larger than the lateral ones : fruit broadly obovoid, 1.5-2 mm. long. 



In sand, Texas. 



3. Phyla nodiflora (L. ) Greene. Foliage strigillose. Stems branched at the base ; 

 branches prostrate, creeping, 2-7 dm. long, more or less branched : leaves opposite, some 

 commonly clustered ; blades spatulate, 1-3 cm. long, serrate from above the middle to 

 apex, nearly sessile or short-petioled : peduncles much longer than the subtending bracts : 

 spikes becoming cylindric, 1 cm. long, 5 mm. thick: bracts flabellate, 1.5-2 mm. long, 

 often 3 mm. broad, apiculate : calyx puberulent, 2 mm. long : corolla purple to white, 2 

 mm. long : fruit obovoid, 1 mm. long. [Lippia nodiflora L.] 



In sandy soil, Georgia to Florida. 



4. Phyla lanceolata (Michx. ) Greene. Foliage strigillose. Stems commonly branched 

 at the base ; branches procumbent, creeping, 1-4 dm. long, simple or branching : leaves 

 opposite, some occasionally clustered in the axils; blades elliptic-lanceolate, 1.5-5 cm. 

 long, acute, sharply serrate, except the cuneate base, short-petioled, the nerves ending in 

 the sinuses : peduncles longer than the subtending leaves : heads globular, becoming cylin- 

 dric, 9-15 mm. long at maturity : bracts rhombic, 2-3 mm. long, acute : calyx about 2 mm. 

 long : corolla pale blue, 2-2.5 mm. long : fruit 1-1.5 mm. long. 



4. LIPPIA L. 



Shrubs or shrubby plants, more or less aromatic. Leaves opposite : blades usually 

 toothed. Flowers in short-peduncled axillary congested spikes, each subtended by a per- 

 sistent imbricated bract of an acute or lanceolate type, in several series. Calyx 2-lobed, 

 compressed and keeled. Corolla much longer than the calyx : tube incurved, not swollen ; 

 limb 2-lipped. Stamens 4, didynamous. Ovary 2-celled, with 1 ovule in each cavity. 

 Fruit separating into 2 nutlets. 



1. Lippia geminata H.B.K. Perennial, minutely pubescent. Stems 4-9 dm. tall : 

 leaf -blades ovate to oblong-ovate, 1.5-4 cm. long, acute, serrate, with nerves impressed 

 above, canescent beneath, abruptly narrowed or truncate at the base ; petioles shorter than 

 the blades : peduncles mostly solitary, somewhat longer than the subtending petioles : bracts 

 ovate-lanceolate, acuminate, 3-5 mm. long, ciliate : calyx 1.5 mm. long, villous-hirsute : 

 corolla purple or violet, about 4 mm. long ; tube minutely hirsute above the middle ; limb 

 about 2.5 mm. high, the lower lip much the largest. 



In low grounds, southern Texas and tropical America. 



5. GONIOSTACHYUM Small. 



Shrubs or shrubby plants, mostly aromatic. Leaves opposite : blades mostly toothed. 

 Flowers in peduncled axillary congested spikes, which are often in pairs. Bracts broad, 

 4-ranked, carinate-conduplicate, persistent. Calyx 2-lobed, compressed and somewhat 

 keeled. Corolla surpassing the calyx: tube abruptly swollen near the middle ; limb 2- 

 lipped. Ovary 2-celled, with 1 ovule in each cavity. Fruit separating into 2 nutlets. 



1. Goniostachyum gravfeolens (H.B.K.) Small. A branching shrub 5-12 dm. 

 tall, with finely pubescent foliage. Leaf -blades oblong-ovate to ovate, 1-3 cm. long, 

 rounded at the apex, finely crenate, rugose, scabrous above, rounded or subcordate at base : 

 petioles much shorter than blades : peduncles 3-6 at an axil, shorter than subtending leaves : 

 bracts imbricated, ovate or hastate, 3 mm. long, longer than calyx, acute : calyx 2 mm. 

 long ; lobes triangular, much shorter than the tube : corolla yellowish white, about 4 mm. 

 long, puberulent ; tube swollen above the middle ; limb 2.5-3 mm. broad, the lobes crisped. 

 [Lippia graveolens H.B.K.] 



In dry soil. Texas near the Rio Grande to Mexico. 



