ACANTHACEAE 1085 
or short acuminate, undulate, acuminate or rounded at the base, manifestly petioled : 
calyx bristly ; lobes linear-lanceolate to broadly linear, 2.5-3 em. long: corolla blue or 
nearly white, 5-6 cm. long; tube about as long as the throat: limb 5-7 cm. broad : cap- 
sules 1-1.5 cm. long. 
In dry soil, Pennsylvania to Wisconsin, Florida and Texas, Spring and summer.—A variety with 
narrower leaf-blades and mostly,cleistogamous flowers, is R. strepens micrántha (Engelm. & Gray) 
Britton. 
5. STENÁNDRIUM Nees. 
Perennial acaulescent or short-stemmed herbs, with pubescent foliage. Leaves ap- 
proximate: blades flat, entire. Flower-spikes terminal, bracted. Calyx sessile: lobes 5, 
narrow, slightly unequal. Corolla rose-colored or purplish : tube terete, slender, slightly 
curved at the throat: limb oblique, spreading: lobes 5, unequal, imbricated. Stamens 4, 
didynamous, included: anthers 1-celled. Ovary 2-celled. Stigmas 2-lobed. Ovules 2 in 
each cavity. Capsule oblong or nearly fusiform, slightly angled. Seeds somewhat flat- 
tened, roughened or pubescent. 
1. Stenandrium Floridànum (A. Gray) Small. Foliage deep green. Leaves basal, 
few : blades ovate or oblong-ovate, 2-3 cm. long, obtuse, glabrous except the upper side of 
the midrib near the base, slightly undulate, rounded or subcordate at the base ; petioles 4 
as long as the blades, hirsute: scapes erect, solitary or clustered, surpassing the leaves: 
spikes few-flowered, 2-5 cm. long: bracts linear-lanceolate, 10-13 mm. long, acuminate 
and bristly-tipped, ciliate ; upper ones hispidly so: calyx puberulent : lobes linear-subulate, 
6-9 mm. long: corolla about 2 cm. long: capsules about 1 em. long : seeds 4 mm. in diam- 
eter, densely strigose with yellowish hairs. [S. dulce var. Floridanum A. Gray.] 
In pine woods, Florida. Spring to fall. 
6. TETRAMERIUM Nees. 
Perennial caulescent herbs or partly shrubby plants, with pubescent foliage. Leaves 
opposite: blades entire. Flowers sessile or short-pedicelled and often solitary in the axils 
of the bracts. Calyx relatively small: lobes 4-5, slender. Corolla 2-lipped : tube slender, 
terete: upper lip entire, concave: lower lip flat, spreading, 3-lobed. Stamens 2, about 
equalling the corolla: filaments adnate to the mouth of the corolla-tube: anthers 2-celled, 
the sacs equal, disjoined by the connective. Staminodia wanting. Ovary 2-celled. Ovules 
2 in each cavity. Capsule contracted into a solid stipe-like base. 
1. Tetramerium platystégium Torr. Foliage puberulent. Stems more or less branched, 
3-6 dm. tall: leaf-blades narrowly oblong to oblong-lanceolate, 2-5 cm. long, obtuse or 
acutish, somewhat undulate, short-petioled : spikes 1.5-5 cm. long: bracts ovate to ovate- 
lanceolate, acuminate, about 1.5 em. long, imbricated : calyx about 2 mm. long; lobes 
subulate, much longer than the tube: corolla purple, 10-15 mm. long ; tube slender, longer 
than the narrowly oblong lobes: capsules less than 1 em. long, body longer than the stipe- 
like base. 
In valleys, southern Texas. Spring. 
7. DIAPEDIUM Konig. 
Annual or usually perennial caulescent herbs. Leaves opposite: blades entire. 
Spikes conspicuously bracted. Calyx sessile, hyaline: lobes narrow or bristle-like, equal 
or nearly so. Corolla blue, violet or red, elongated, 2-lipped : tube terete, slightly dilated 
above: upper lip erect, concave, entire or notched: lower lip more or less spreading, 2- 
lobed. Stamens 2, barely equalling the lips: filaments adnate to the mouth of the 
corolla-tube : anthers 2-celled. Staminodia wanting. Ovary 2-celled. Styles filiform, 
with entire or slightly 2-lobed stigmas. Ovules 2 in each cavity. Capsule with an ovoid 
or suborbicular body and a solid stipe-like base. Seeds 4 or fewer, smooth or coarsely 
granular. 
Corolla red or crimson, curved : tube longer than the lips. : 1. D. assurgens. 
Corolla purple or pink, nearly straight: tube and lips about equal in length. : 
Bracts rounded or merely mucronulate at the apex. 2. D. brachiatum, 
Bracts acuminate or cuspidate-acuminate at the apex. 3. D. attenuatum, 
l. Diapedium assürgens (L.) Kuntze. Foliage glabrous or puberulent. Stem, 
3-9 dm. tall, rather widely branched : leaf-blades ovate to elliptic or oblong-lanceolates 
2-10 cm. long, acute or obtusish, undulate, slender-petioled : outer bracts spatulate or lin- 
ear-spatulate, 8-12 mm. long; inner bracts subulate, shorter: calyx about 4 mm. long: 
