926 GENTIAN ACEAE 



late to linear-lanceolate, 8-12 mm. long, acute, more than j as long as the tube : capsule 

 often shorter than the calyx. 



In dry soil, Arkansas to Texas. Spring to fall. 



4. Erythraea calycosa Buckl. Stems 1-6 dm. tall, more or less branched, the branches 

 ascending or spreading: leaves spatulate to oblong or linear, 1-3 cm. long, acute or apiculate, 

 entire, sessile : calyx 8-10 mm. long ; lobes linear-setaceous : corolla pink ; lobes oval or 

 oblong, obtuse ; 7-10 mm. long ; tube slightly surpassing the calyx : capsule 8-10 mm. long, 

 cylindric-oblong. 



In wet soil, Missouri to Texas and New Mexico. Spring to fall. 



2. EUSTOMA Salisb. 



Annual caulescent herbs, with glabrous and usually glaucous foliage. Leaves opposite: 

 blades sessile or clasping. Flowers in terminal panicles, or sometimes solitary. Calyx 

 with 5-6 narrow keeled lobes. Corolla white, blue or purple : tube campanulate : lobes 

 5-6, oblong or broadened upward, convolute in the bud, usually erose-denticulate. Sta- 

 mens 5-6, adnate to the throat of the corolla-tube : filaments filiform : anthers versatile, 

 nearly straight, or recurved at maturity. Ovary 1-celled : stigmas 2. Ovules numerous. 

 Seeds pitted. The plants flower from spring to fall. 



Style short, little longer than the stigmas : corolla-lobes oblong or nearly so : capsule oval-elliptic. 



1. E. exaltatum. 

 Style elongated, much longer than the stigmas : corolla-lobes obovate : capsule 

 oblong-cylindric. 

 Leaves below the inflorescence with ovate to oblong blades : capsule acuminate- 

 tipped. 2. E. RusselUanum. 

 Leaves below the inflorescence with lanceolate blades : capsule blunt. 3. E. gracile. 



1. Eustoma exaltatum (L. ) Griseb. Stems 1-9 dm. tall, simple or branching. 

 Leaf-blades oblong to oblong-lanceolate, 1.5-7 cm. long, apiculate or acute, entire, sessile 

 and partly clasping : calyx about 1.5 cm. long ; lobes subulate from a broader base : corolla 

 blue, 3-3.5 cm. long; tube barely as long as the calyx ; lobes mainly oblong, about twice 

 as long as the tube : capsules oblong, 2-2.5 cm. long, obtuse. 



In sandy soil, Florida to Texas, California and Mexico. Also in the West Indies. 



2. Eustoma Russellianum (Hook.) Griseb. Stems 3-9 dm. tall, more or less 

 branched. Leaf-blades ovate to oblong, 2-8 cm. long, acute or apiculate, sessile and partly 

 clasping: calyx glabrous, 1.5-2 cm. long; lobes subulate from a broader base: corolla 

 lavender-purple, 4-5.5 cm. long ; tube often barely as long as the calyx ; lobes cuneate to 

 obovate, about 4 times as long as the tube : capsules oblong, about 1.5 cm. long, pointed. 



In dry soil, Nebraska to Colorada, Texas and New Mexico. 



3. Eustoma gracile Engelm. Smaller tlian E. Russellianum and more slender. 

 Leaves few ; blades lanceolate, sometimes narrowly so, acuminate : corolla 3.5-4 cm. long : 

 capsule oblong, about 1 cm. long, blunt. 



On plains, southern Texas and northern Mexico. 



3. SABBATIA Adans. 



Annual or biennial caulescent herbs, with glabrous foliage. Leaves opposite or rarely 

 whorled : blades sessile or rarely petioled, or clasping. Flowers solitary or in terminal 

 open cymes. Calyx pedicelled : lobes 4, 2 narrow. Corolla white, pink, cream-colored or 

 rose, with a distinct eye, rotate : lobes 4-12. Stamens 4-12 : filaments adnate to the short 

 corolla-tube, filiform : anthers coiled. Ovary 1-celled, with intruding placentae : styles 

 united : stigmas shorter than the style or longer. Capsule short, 2-valved. Seeds numer- 

 ous, reticulated. 



A. Corolla-lobes 4-5, or sometimes 6-7. 

 Branches of the stem all opposite. 



Stems terete : calyx-lobes shorter than the tube. 1. 5. viacrophylla. 



Stems 4-angled or 4-winged : calyx-lobes longer than the tube. 

 Stigmas longer than the style. 



Upper leaf-blades acute": calyx-lobes subulate. 2. S. lanceolala. 



Upper leaf-blades obtuse, apiculate : calyx-lobes linear. 3. S. paniculata. 



Stigmas shorter than the style. 



Stem-leaves with blades several times longer than broad, sessile. 4. S. angusti/olia. 



Stem-leaves with blades little longer than broad at the most, clasping. 5. <S. angularit. 

 Branches of the stem alternate, or some of the lower ones rarely opposite. 

 a. Calyx-tube prominently 5-ribbed, mostly enclosing the capsule. 



Leaf-blades mostly broadest near the base, clasping. 6. S. campestris. 



Leaf-blades mostly broadest at the middle, sessile. 7. S. carnosa. 



