LOASEÆ. I. 
to the calyx (f. 10.a. f. 11. e.), or inclosed within it, 1-celled, with 
_ several parietal placentas (f. 11.), or with 1 free central lobed 
one. Style 1, composed of 3-5-7-joined ones, crowned by as 
many lobes or stigmas. Capsule dry or succulent, crowned by the 
calyx (f. 10. d. f. 11. g. f. 12. c.), 1-celled, with several parietal 
placentas (f. 11.), originating at the sutures, and therefore may 
be called marginal, 3-4-7-valved ; placentas equal in number to 
the valves, sometimes drawn out so far as to form dissepiments 
(f. 11. f.). Seeds numerous, without arillus. Embryo lying in 
the axis of a fleshy albumen; with the radicle pointing to the 
hilum, and flat small cotyledons.—American herbs more or less 
pilose or hispid, with the hairs or bristles usually stinging like 
those of the nettle, in consequence of their secreting an acrid 
juice. Leaves opposite or alternate, exstipulate, simple, but 
usually variously divided. Peduncles axillary, 1-flowered. 
Flowers elegant. This order is distinguished from Onagrarite 
by its unilocular ovaria, and indefinite stamens, part of which 
are sterile; and perhaps by the latter character, and the addi- 
tional 5 petals, connected with Passiflorée, with which they 
sometimes also accord in habit. Their rigid stinging hairs, 
climbing habit, and lobed leaves resemble those of some Urti- 
cee. On the same account they may be compared with Cucur- 
bitacee, with which they further agree in their inferior unilocular 
fruit, with parietal placentas, and in the very generally yellow 
colour of their flowers. This, indeed, is the order with which, 
upon the whole, Loàseæ must be considered to have the closest 
affinity, ; 
Sinopsis of the genera. 
1 Bartonia. Tube of calyx cylindrical (f. 10. a.); limb 5- 
parted (f. 10. a.). Petals 5-10 (f. 10. b.), about equal in shape. 
Stamens numerous (f. 10. c.). Capsule 3-7-valved ; each pla- 
centa bearing 2 rows of seeds. 
2 Brumensa’cuta. Tube of calyx spirally twisted (f. 11. e.); 
limb 5-parted (f£. 11. g.). Petals 10 (f. 11. 5.); 5 outer ones 
cucullate, and the 5 inner ones scale-formed, each scale inclosing 
2 sterile filaments. Fertile stamens disposed in 5 bundles (f. 
11. b.). Fruit dividing into 10 parts at the base. 
3 Loasa. Tube of calyx not twisted (f. 12. a.) ; limb 5- 
parted (f. 12. ¢.). Petals 10 (f. 12. b.); the 5 inner ones scale- 
formed, bearing 2 sterile filaments inside. Outer series of 
stamens sterile and free ; inner ones disposed in 5 bundles, but 
distinct. Capsule 1-celled, 3-valved at the apex. 
4 Catépnora. The fruit is oval, bursting into 3 valves from 
the base upwards; the placentas then separate from the sides of 
the capsule, and have the appearance of 3 arched columelle. 
The rest as in Lodsa. 
5 Menrze'tia. Tube of calyx cylindrical (f. 13. b.); limb 
5-lobed (f. 13. d.). Petals 5 (f. 18. a.). Stamens free, usually 
disposed in bundles (f. 13. e.). Capsule turbinate, 3-valved, 
few-seeded E 13. £.). 
6 Kraproruta. Calyx with a turbinate tube, and a 5- 
parted limb. Petals 4. Stamens numerous, 4-5 sterile in front 
of each sepal, and 4-5 fertile in front of each petal. Fruit 
baccate, few-seeded. 
- very smooth; seeds winged. ©. 
61 
I. BARTO'NIA (Benj. S. Barton, M. D., professor of botany 
at Philadelphia). Sims, bot. mag. t. 1487. Nutt. gen. amer. 
1. p.297. Pursh, fl. amer. sept. 1. p. 327. D. C. prod. 3. p. 
339. but not of Willd. 
Lin. syst. Zcosándria, Monogjnia. Tube of calyx cylin- 
drical (f.10. a.}, closely girding the ovarium, but probably distinct 
from it ; limb 5-parted (f. 10. a.), permanent. Petals 5-10 (f. 10. 
b.), unguiculate, the same shape, inserted in the calyx. Stamens 
indefinite (f. 10. c.), inserted with the petals, but shorter than 
them ; filaments free (f. 10. c.) ; outer ones sometimes sterile ; 
anthers oblong. Style filiform (f. 10. e.), marked with 3-7 spi- 
ral stripes (f. 10. e.). Capsule oblong, 1-celled, 3-7-valved ; 
placentas bearing 2 rows of seeds each. Seeds compres- 
sed.—Herbs downy from stiff and bearded hairs. Leaves 
alternate, interruptedly pinnatifid. Flowers large, terminal, 
solitary, white or yellow, expanding in the evening, becoming 
reddish as they fade. 
1 B. orna‘ra (Nutt. gen. amer. 1, p. 297.) lobes of leaves 
acutish ; capsule surrounded by bracteas, 5-7-valved; seeds some- 
what emarginate. &.F. Native of Upper Louisiana, in argil- 
laceous soil, on the banks of the river Missouri. B. decapétala, 
Sims, bot. mag. 1487. Petals 10, white. 
Ornamental Bartonia. Fl. Jul. Sept. Clt. 1811. Pl. 1 to 2 ft. 
2 B. nu'pa (Nutt. l. c.) lobes of leaves obtuse; capsule 3- 
valved, naked; seeds winged ; outer stamens petaloid, usually 
sterile. g.F. Native on the banks of the Missouri, on gra- 
velly hills. Petals 10. 
BARTONIA. 
Naked-fruited Bartonia. Fl. Jul. Sept. Clt. 1811. Pl.1 to 2 ft. 
FIG. 10. 
3 B. txvicau’ Lis (Dougl. mss. 
ex Hook, fl. bor. amer. 1. p. 221. 
t. 69.) petals 5 ; petaloid stamens 
5; bracteas wanting; stems 
H. Native of North America, 
on the gravelly islands and rocky 
shores of the Columbia, near the 
Great Falls. Flowers shining, 
yellow. An ornamental plant, 
not inferior to B. ornàta, but 
differs from it in the want of the 
large, jagged bracteas, as well as 
in its fewer petals and winged 
seeds, 
Smooth-stemmed Bartonia. Pl. 
2 to 3 feet. 
4 B. rarvirròra (Dougl. mss. ex Hook. fl. bor. amer, 1. 
p- 221.) petals 5; petaloid stamens 5-7; bracteas wanting ; 
stem scabrous; seeds winged. ¢.F. Native of North Ame- 
rica ; abundant in calcareous rocky situations, and micacious 
sandy banks of streams, in the interior parts of Columbia. 
Flowers smaller than those of the preceding species, but it is 
probably hardly more than a variety of that plant. It differs 
from B. nida, Nutt. in the number of the petals. The name 
would be more applicable to the following species. 
Small-flowered Bartonia. PI. 1 to 2 feet. 
5 B. axzicav'tis (Dougl. mss. ex Hook. fl. bor. amer. 1. p. 
222.) petals 5, obovate, small; petaloid stamens wanting ; brac- 
teas wanting ; stems short, shining, white. ©. H. Native of 
North America, on arid sandy plains of the river Colombia, 
under the shade of Púrshia tridentata. Mentzélia albicaúlis, 
Doug]. mss. Acrolasia bartonioldes, Presl. reliq. Heenk, 2. p. 
39. t. 55. Petals yellow. 
White-stemmed Bartonia. Pl. decumbent. 
6 B. axse’scens (Arnott, in Cheek, journ. 3. p. 273.) stem 
with a white shining epidermis ; leaves sinuately toothed ; cap- 
sule naked, 3-valved; seed broadly marginate; flowers dis- 
