ACANTHACEAE 1225 
long, ae the anterior lip appressed to or partly investing v posterior one: 
psule mm. long, ob ong.—(SWAMP- 
ca 10-12 ng, obliquely p seeds 2.5 mm 
LOUSEWORT.)— Wet meadows and swa SUP Ridge and more N provinces, 
N. C. to Nebr., Man., and Mass. uin “hal 
39. MELAMPYRUM L. Annual herbs, the stem minutely pubescent. 
Leaves opposite, all cauline: blades usually entire, thin. Flowers loosely race- 
mose, axillary to foliaceous, entire or basally fimbriate bracts. Bractlets none 
Calyx-lobes 4 (the posterior sepal lacking), as long as the tube or longer, 
nearly equal, the aes and anterior pairs divaricate. Corolla 2-lipped, 
mainly white: posterior lip arched and hooded: anterior lip slightly 3-lobed 
with a densely puberulent palate. Stamens 4, included, didynamous: fila- 
ments glabrous: anthers ee pube 
cent, mucronate at base. tigm capitate. 
apsule somewhat decurved, ds 
unequal, the posterior cavity loculieidal 
Seeds 2 in each eavity, plump, smooth, wing- 
less.—About 50 species, of the Northern 
Hemisphere. 
1 lineare Desr. Stem 1-4 dm. tall: 
ig pan linear to laneeolate-linear: 2-6 
ong: braets VERI oy fimbriate: 
long: 
a -lobes ova caudate, 2-4 mm 
corolla 7—10 . lohg: id osterior lip yellow- 
ish-tipped, ciliolate; anterior lip pet 2 D 
palate egg-yellow: capsule onsidor rm-o 5-7 mm. long: seeds ovoid, 2-3 mm. 
long, mostly brown. [M. Wb - (Chapm. Fl. ) ]-— (Cow wntsaT )—Open 
woods, old fields, and pastures, Coastal Plain and adj. provinces, N. C. to N. 
Y.—M. latifolium Muh md haps pg spec TETTE distinct, p larger leaf- 
blades varying from to linear- E shortly fimbr iate or entire 
bracts, a broader Mer p seeds 3-4 mm. long, ranges, in the Blue Ridge. 
and adj. provinees, from Ga. to Wis., Que., an nd N.S. 
FawiLY 15. ACANTHACEAE — ACANTHUS FAMILY 
rbs or shrubs. Leaves alternate, opposite, or whorled: blades 
simple. owers perfect, irregular. Calyx of usually 5 partly united 
sepals. Corolla of 5 partly united petals, 2-lipped or sometimes essen- 
tially regular. droecium of 4 didynamous, or of 2 equal stamens, one 
pair being abortive or apr: Gynoecium of 2 united carpels. Ovary 
c mon each cavity. it a capsule, often with 
a stipe-like base, the valves opening elastically —About 175 genera and 
2,000 species, widely distributed in temperate and tropical regions. 
Vines: seeds globula 1. THUNBERGIA. 
Erect D. diffuse Herbs: seeds flat 
Leaves normal only at the en of the stem, those on the 
a reduced to firm sheathing imbricate scales and pass- 
i j 2. TUBIFLORA. 
Corolla convolute in the , bud. 
Corolla conspicuously PDD capsule terete, not 
constricted at the bas 
Corale bru! if at all ^5-lipped : capsule constricted 
nto a stipe-like base. 
3. HYGROPHILA., 
