256 UMBELLIFER2. II. Cranrzta. III. Dimerorta. 
white and spongy inside; the channels between the ribs fur- 
nished with 1 brown distinct vitta each, and the commissure 
with 2 vittee.—Small, glabrous, creeping herbs. Leaves sessile, 
narrow, obtuse, quite entire, lined with 5 transverse nerves, as 
the seminal leaves and petioles of Eryngium corniculatum. Pe- 
duncles axillary, erect. Umbels simple, 8-10-flowered. Invo- 
lucrum 5-6-leaved. Flowers white, pedicellate, hermaphrodite, 
uniform. 
1 C. rnea ra (Nutt. 1. c.) leaves sessile, cuneate-linear, ob- 
tuse; peduncles length of leaves; umbels 8-10-flowered. 2. 
B. H. Native of North America, in saltish, boggy, or inundated 
places, from New Jersey to Florida. Hydrocétyle lineata, Michx. 
fl. bor. amer. 1. p. 162. Rich. hydr. no. 54. f. 38. Ell. sketch. 
1. p. 247. H. ligulata, Bosc. herb. H. Chinénsis, Spreng. in 
Schultes, syst. 6. p. 355. and perhaps of Lin. spec. p. 339. 
Lined-leayed Crantzia. Fl. June, Aug. Cit. 1818. Pl. cr. 
2 C. arrenua‘ta (Hook. et Arn. in bot. misc. 2. p. 346.) 
leaves elongated, attenuated, 3-times longer than the peduncles. 
Y. B. F. Native of Buenos Ayres. Differing from C. lineata 
remarkably inits much longer and attenuated foliage. 
A ttenuated-Jeaved Crantzia. Pl. er. 
Cult, See Hydrocétyle above for culture and propagation. 
IN. DIMETO'PIA (from dierwroc, dimetopos, having 2 
faces; in reference to the mericarps of the fruit being unlike 
each other). D.C. prod. 4. p. 71. 
Lin. syst. - Pentdndria, Digynia. Teeth of calyx obsolete. 
Petals oval-oblong, entire. Styles short. Fruit didymous ; 
mericarps nearly globose, rather contracted at the commissure, 
of unequal shape and size: the one muricated with rows of 
blunt compressed tubercles, the other echinated by conical tu- 
bercles, which are drawn out at the apex into soft prickles. 
Seed ?—An annual herb, hardly a finger in height. Stem short, 
branched, beset with scattered pili. Leaves tripartite ; lobes 
cuneate, linear-oblong, bluntly tridentate at the apex, or trifid. 
Peduncles opposite the leaves, and longer than them. Umbels 
simple, usually 5-flowered. Involucrum of 5 linear-lanceolate 
leaves, which are the length of the flowers. Flowers white.— 
Habit almost of Erigénia; the fruit agrees with that of Sani- 
cula, and the petals with those of Hydrocétyle. 
1 D. eusi’tra (D. C. 1. c.) ©. H. Native of New Holland, 
at King George’s Sound, and at Port Western. ’ 
Small Dimetopia. Pl. 4 foot. s 
Cult. Sow the seeds in a warm sheltered situation, in the 
open ground. 
IV. ERIGE'NIA (from npiyevsia, erigeneia, the name of 
Aurora, the harbinger of day or of the spring ; in allusion to the 
early appearance of the plant in spring). Nutt. gen. amer. 1. 
p- 187. D. C. coll. mem. 5. p: 27. prod. 4. p. 71.—Hydro- 
cótyle species, Pursh. and Spreng.—Sison, spec. of Michx. 
Lin. syst. Pentándria, Digynia. Margin of calyx obsolete. 
Petals equal, obovate, expanded, entire. Styles permanent, su- 
bulate, very long. Fruit oval-lanceolate, laterally compressed ; 
mericarps gibbously convex, marked with 3 stripes ; commissure 
flat, without a margin.—A small, smooth herb. Root tuberous, 
globose. Leaves 1-2, radical, petiolate, biternate. Umbels ir- 
regular, imperfect, 3-4-rayed : umbellules 3-5-flowered. True 
involucrum wanting, but in place of it there is a multifid leaf; 
leaves of involucel few, unequal. Petals white. Anthers ex- 
serted, dark purple. This genus agrees with A’mmi in the 
compound inflorescence, and with Bùnium in the tuberous root. 
1 E. surposa (Nutt. l. c.). 4. B. H. Native of North Ame- 
rica, in Pennsylvania, Ohio, Missouri, Tenessee, &c. in humid 
and inundated places. Sison bulbdsum, Michx. fl. bor. amer. 1. 
IV. Ericenra. V. Micropreura. VI. Diniscus, 
p. 169. Hydrocdétyle compésita, and H. ambígua, Pursh. and 
Spreng. ex Nutt. ]. c. Spreng. umb. spec. 5. t. 5. f. 9. 
Bulbous-rooted Erigenia. Pl. 4 foot. 
Cult. This plant should be grown in a pot, under which 
should be placed a pan of water. 
V. MICROPLEU'RA (from juxpoc, micros, small, and 
mevpa, pleura, a rib; the ribs of the fruit are small and capil- 
lary). Lag. obs. aparas. p. 15. D. C. coll. mem. 5. p. 27. 
prod. 4. p. 71. 
Lin. syst. Pentándria, Digynia. Margin of calyx obsolete. 
Petals equal, entire, acute. Fruit deeply cordate at the base, 
rather foliaceous, emarginate at the apex ; mericarps compressed 
from the sides, obliquely ovate, 7-ribbed ; ribs capillary, curvi- 
linear, ventricose below: the marginal 2 are shorter, and form 
a straight line; the commissure is very narrow, one half shorter 
than the mericarps.—Caulescent glabrous herbs, natives of Chili, 
with the habit of Hydrocétyle ; but the umbels are rarely com- 
pound. Mericarps of fruit probably 9-ribbed, having 2 of them 
obsolete or hidden. i 
1 M. rexiròLa (Lag. 1. c.). Native of the Island of Chiloe. 
Petioles dilated at the base. Leaves alternate, petiolate, cor- 
dately reniform, 6-9-nerved, and veined, crenate, rather mem- 
branous. Umbels terminal, pedunculate, 4-5-rayed ; involucrum | 
foliaceous, composed of 1 leaf; umbellules 3-4-rayed, surrounded 
by small, 3-4-leaved involucels. Flowers 3, middle one fertile 
and nearly sessile, and the 2 lateral ones are male, on short 
pedicels. 
Kidney-leaved Micropleura. Pl. cr. ; 
Cult. ` See Hydrocótyle for culture and propagation, p. 255. 
VI. DIDI'SCUS (from étc, dis, twice, and ĉøkoc, diskos, a 
disk ; the mericarps appear like 2 disks). D.C. coll. mem. 5. 
p- 28. t.4. Hook. bot. mag. t. 2875.—Lampra, Lindl.—Hu- 
gèlia, Rchb. consp. t. 144. 
Lin. syst. Pentándria, Digýnia. Margin of calyx obso- 
lete. Petals oval, entire, bluntish (f. 57. c.), imbricate in ætis 
vation. Styles diverging. Fruit nearly like that of Biscutélla, 
hence the name, emarginate at the base; mericarps very much 
compressed from the sides, without any vittæ, a little muricated, 
or beset with dot-like hairs, 5-ribbed; ribs filiform: the 2 inner 
ones near the commissure, very short: the 2 middle ones short 
and curvilinear: and the dorsal one a little winged. Seed much 
compressed. Carpophore undivided.—Herbs, natives of New 
Holland. Stems terete, branched. Leaves variously parted, 
or lobed: lobes rather cuneated, cut. Umbels simple. Invo- 
lucrum of many leaves, which are concrete at the base (£. 57.a.) 
Perhaps merely a section of Trachymène, but the margin of the 
calyx is obsolete, not 5-toothed; the petals obtuse, not acute, 
and the fruit is compressed, not inflated, &c. 
1 D. cærv`Leus (Hook. bot., 
mag. 2875. D.C. coll. mem. 5. 
t. 4.) plant hairy; leaves petio- 
late, 3-parted; having the parti- 
tions 2-3-cleft, and the lobes 2- 
3-toothed ; umbels simple, on 
long peduncles; involucrum of 
many leaves, when young re- 
flexed. ©. F. Native of New 
Holland. Trachyméne cyanea, 
Cunningh. mss. Trachyméne 
cœrùlea, Graham, in edinb. phil. 
journ. 1828. Sept. p. 373. Lindl. 
bot. reg. no. 1225. Hugélia 
cyanæ'a, Rchb. icon. exot. t. 201. 
Flowers blue ; each umbel having 
FIG. 57. 
