MONOPETALOUS EXOGENOUS PLANTS. 403 



white, ill axillary or terminal heads or spike-like cymes ; 

 cali/x 5--p'di'ted, mostly leafy -bractetl ; corolla bilabiate, most- 

 ly reversed, the lo2ver lip 3-lobed, the iqjpei^ 2-cleft or en- 

 tire ; stamens 2 ; anther-cells equal, one placed behind the 

 other ; capsule oblong or oval, bearing 2 or 4 seeds below 

 the middle ; the partitions at length free from the valves. 



D. BRACHIATA, Sprcng. Leaves thin, oblong-ovate, 

 acuminate, abruptly contracted into a long and slender 

 petiole ; stem 6-angled, with numerous spreading branches ; 

 spikes solitary or 2-3 together, interrupted, unequal ; 

 bracts oblong, mucronate, narrowed at the base, at length 

 inflated ; corolla small, purple. Stem l°-2° high ; plant 

 smooth or nearly so. 



DEEJERA. 



D. PARVIFLORA, Buckley. Leaves opposite, lanceolate, 

 shortly petiolate, acuminate, obtuse at base ; spikes termi- 

 nal, naked ; cali/x deeply 5-cleft ; segments long-subulate ; 

 tube of corolla narrow, twice the length of the calyx ; 

 flowers opposite, sessile, shortly interrupted on the spikes. 

 — Shruly 3-4 feet high, with slender branches ; the young 

 branches and calyx glandular pubescent, the rest of the 

 plant smooth ; petioles about 1 line long; floivers 6-8 lines 

 long; Jrac^c<? lanceolate, shorter than the calyx. Western 

 Texas. June. 



86. VERVAIN FAMILY. Order, Verbenace^. 



Chiefly Jiej^bs or shrubs^ with 4-angled mostly rough 

 stems, and opposite and exstipulate leaves ; floivers spiked, 

 capitate, or cymose ; calyx 4-5-cleft or parted, free ; corolla 

 regular and salver-shaped, or more or less bilabiate, 4-5- 

 lobed ; stamens ^-b, inserted on the tube of the corolla; 

 anthers 2-celled ; ovary entire, 1-8-celled, with 1 or (in 

 Avicennia) 2 ovules in each cell ; style simple, terminal ; 



