ACANTHACEAE 1087 



mm. long ; lobes subulate, about as long as the subtending bracts : corolla pale blue or 

 purple, 1.6-2 cm. long ; tube slender, about twice as long as the tips, the upper lip notched, 

 the lower one longer, its 3 lobes oblong or obovate-oblong : capsules 8-10 mm. long. 



In dry ground, Texas to New Mexico and adjacent Mexico. Spring and summer. 



3. Siphonoglossa longiflora (^Torr.) A. Gray. Stems branched at the base, the 

 branches 1-2.5 dm. tall, cinereous-puberulent, erect or erect-ascending : leaf -blades lanceo- 

 late, 2-4 cm. long, blunt, undulate, often cuneate at the base, short-petioled : calyx 7-9 

 mm. long : lobes subulate-linear, about as long as the subtending bracts : corolla wnite or 

 yellowish white, 3-4 cm. long ; tube slenderly cylindric, about twice as long as the lips, 

 the upper lip notched, the lower lip with 3 lobes each about as large as the upper lip : 

 capsules 8-9 mm. long. 



In dry or rocky soil, Texas to Arizona and Sonora. Summer. 



10. JUSTI'CIA L. 



Perennial caulescent herbs or rarely shrubs, various in habit. Leaves opposite : blades 

 entire. Flowers solitary, clustered or cymose in the axils of the bracts. Calyx-lobes 4-5, 

 narrow, equal or nearly so. Corolla white, pink, violet or red, 2 lipped : tube very short, 

 straight or curved, manifestly dilated into a throat : upper lip erect or incurved, entire or 

 2-cleft : lower lip spreading, 3-lobed. Stamens 2, not surpassing the upper lip : filaments 

 adnate to the mouth of the corolla-tube : anthers 2-celled ; sacs separate, oblique. Stam- 

 inodia wanting. Ovary 2-celled. Stigma entire or 2-toothed. Ovules 2 in each cavity, 

 Capsule 8 more or less flattened, contracted into a solid stipe-like base. Seeds 4 or fewer, 

 smooth or variously roughened. 



1. Justicia Wrightii A. Gray. Stems branched at the woody base, the branches 

 erect or ascending, 0.5-2 dm. tall, cinereous-pubescent : leaf -blades firm, those of the lower 

 leaves obovate, barely 1 cm. long, those of the upper leaves lanceolate or linear-lanceolate, 

 3-7 mm. long, entire, mucronate-acute : flowers solitary and sessile in the upper axils : 

 bracts similar to the accompanying leaves : corolla purplish, 8-9 mm. long ; tube rather 

 campanulate ; upper lip with two narrow lobes ; lower lip with oval-obovate lobes. 



On limestone ridges, mainly along the San Felipe River, Texas. Spring and summer. 



11. YEATESIA Small. 



Perennial caulescent herbs, with bright green foliage. Leaves opposite : blades en- 

 tire. Spikes dense, conspicuously bracted. Calyx sessile : lobes slender, erect. Corolla 

 white, slightly 2-lipped : tube slender, somewhat dilated into a throat : lobes 4, nearly 

 equal, flat. Stamens 2 : anthers 2-celled ; sacs unequally inserted and one slightly 

 oblique. Staminodia wanting. Ovary 2-celled. Stigma capitate. Ovules two in each 

 cavity. Capsule narrowed into a stipe-like base. Seeds glabrous, minutely wrinkled. 



1. Yeatesia viridiflora (Nees) Small. Foliage nearly glabrous, or puberulent, bright 

 green. Stems 2-6 dm. tall, branched, constricted above each node : leaf-blades elliptic or 

 elliptic-lanceolate, 5-15 cm. long, acuminate at both ends, undulate, bracts ovate to ob- 

 ovate, 1-1.5 cm. long, ciliate : calyx glabrous or nearly so ; lobes linear-subulate, 4-5 mm. 

 long : corolla white or pink, 1.5 cm. long, the lower lip 3-lobed, spreading, the upper 

 reflexed, barely lobed : stamens exserted : capsule 1 cm. long, the stipe-like base shorter 

 than the body. I Justicia laetevirens Buckl., not Vahl. Rhytoglossa viridiflora Nees.] 



In shaded soil, Tennessee to Georgia, Florida and Texas. Summer. 



12. DIANTHERAL. 



Perennial caulescent herbs, with glabrous or pubescent foliage. Leaves opposite : 

 blades entire or rarely toothed. Flowers several, on axillary peduncles. Calyx-lobes 

 4-5, slender. Corolla white or colored, strongly 2-lipped : tube variable in length, straight 

 or curved : upper lip erect or ascending, entire or 2-tooth : lower lip spreading, 3-lobed. 

 Stamens 2 : filaments adnate to near the mouth of the corolla-tube, not surpassing the 

 upper lip : anthers 2-celled, the sacs separated by a broad connective. Ovary 2-celled. 

 Stigma entire or 2-lobed. Ovules 2 in each cavity. Capsule contracted into a stipe-like 

 base. Seeds 4 or fewer, flat, ovate to suborbicular. WATER WILLOW. 



