926 GENTIANACEAE 
late to linear-lanceolate, 8-12 mm. long, acute, more than à as long as the tube: capsule 
often shorter than the calyx. 
In dry soil, Arkansas to Texas. Spring to fall. 
4. Erythraea calycósa 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. HUSTOMA 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 l-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: cuju 
ES atum. 
Style elongated, much longer than the stigmas: corolla-lobes obovate: capsule 
oblong-cylindric. 
Leaves below the inflorescence with ovate tooblong blades: capsule acuminate- : 
i 2. E. Russellianum. 
tipped. 
Du Eos the inflorescence with lanceolate blades: capsule blunt. 3. E. gracile. 
1. Eustoma exaltàtum (L.) Griseb. Stems 1-9 dm. tall, simple or branching. 
Leaf-blades oblong to oblong-lanceolate, 1.5-7 em. 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 em. 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 em. 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 than 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 termin 
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. Ba ne = ge plc 6-7. 
ranches o e stem all opposite. . 
Stems terete: calyx-lobes shorter than the tube. 1. S. macrophylla 
Stems 4-angled or 4-winged : ealyx-lobes longer than the tube. 
Stigmas longer than the style. 
Upper leaf-blades acute: calyx-lobes subulate. 2. S. lanceolata. 
_Upper leaf-blades obtuse, apiculate : calyx-lobes linear. 8. S. paniculata. 
Stigmas shorter than the style. ustifolia. 
Stem-leaves with blades several times longer than broad, sessile. _ 4. 8. angularis. 
Stem-leaves with blades little longer than broad at the most, clasping. 5. S. an 
Branches of the stem alternate, or some of the lower ones rarely opposite. 
a. Calyx-tube prominently 5-ribbed, mostly enclosing the capsule. ampestris. 
Leaf-blades mostly broadest near the base, clasping. F s carnosa. 
Leaf-blades mostly broadest at the middle, sessile. TR: 
