256 



UMBELLIFER&. II. CRANTZIA. III. DIMETOPIA. IV. EKIOENIA. V. MICHOPLEURA. VI. DIDISCUS. 



white and spongy inside; the channels between the ribs fur- 

 nished with 1 brown distinct vitta each, and the commissure 

 with 2 vittse. 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. LINEA'TA (Nutt. 1. c.) leaves sessile, cuneate-linear, ob- 

 tuse ; peduncles length of leaves ; umbels 8-10-flowered. I/. 

 B. H. Native of North America, in saltish, boggy, or inundated 

 places, from New Jersey to Florida, Hydrocotyle lineata, Michx. 

 fl. bor. amer. 1. p. 162. Rich. hydr. no. 54. f. 38. Ell. sketch. 

 1. p. 247. H. ligulata, Bosc. herb. H. Chinensis, Spreng. in 

 Schultes, syst. 6. p. 355. and perhaps of Lin. spec. p. 339. 



Lined-leaved Crantzia. Fl. June, Aug. Clt. 1818. PI. cr. 



2 C. ATTENUA'TA (Hook, et Arn. in bot. misc. 2. p. 346.) 

 leaves elongated, attenuated, 3-times longer than the peduncles. 

 I/ . B. F. Native of Buenos Ayres. Differing from C. lineata 

 remarkably in its much longer and attenuated foliage. 



Attenuated-\ea\e& Crantzia. PI. cr. 



Cult. See Hydrocotyle above for culture and propagation. 



III. DIMETO'PIA (from &/ir<iroe, 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 Erigenia ; the fruit agrees with that of Sani- 

 cula, and the petals with those of Hydrocotyle. 



1 D. PUSI'LLA (D. C. 1. c.). O- H. Native of New Holland, 

 at King George's Sound, and at Port Western. 



Small Dimetopia. PI. -j foot. 



Cult. Sow the seeds in a warm sheltered situation, in the 

 open ground. 



IV. ERIGE X NIA (from rjptyivtia, 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- 

 cotyle species, Pursh. and Spreng. Sison, spec, of Michx. 



LIN. SYST. Pentandria, 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 Bunium in the tuberous root. 



1 E. BULBOSA (Nutt. 1. c.). I/ . B. H. Native of North Ame- 

 rica, in Pennsylvania, Ohio, Missouri, Tenessee, &c. in humid 

 and inundated places. Sison bulbosum, Michx. fl. bor. amer. 1. 



p. 169. Hydrocotyle composita, and H. ambfgua, Pursh. and 

 Spreng. ex Nutt. 1. c. Spreng. umb. spec. 5. t. 5. f. 9. 



Bulbous-rooted Erigenia. PI. ^ foot. 



Cult. This plant should be grown in a pot, under which 

 should be placed a pan of water. 



V. MICROPLEU'RA (from /uicpoE, micros, small, and 

 irXevpa, 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. Pentandria, 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 Hydrocotyle ; but the umbels are rarely com- 

 pound. Mericarps of fruit probably 9-ribbed, having 2 of them 

 obsolete or hidden. 



1 M. RENIFOLIA (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. PI. cr. 



Cult. See Hydrocotyle for culture and propagation, p. 255. 



VI. DIDI'SCUS (from IIQ, dis, twice, and TI.-OC, dislos, 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- 

 gelia, Rchb. consp. t. 144. 



LIN. SYST. Pentandria, Digynia. Margin of calyx obso- 

 lete. Petals oval, entire, bluntish(f. 57. c.), imbricate in aesti- 

 vation. Styles diverging. Fruit nearly like that of Biscutella, 

 hence the name, emarginate at the base ; mericarps very much 

 compressed from the sides, without any vittae, 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 (f. 57. .). 

 Perhaps merely a section of Trachymene, but the margin of the 

 calyx is obsolete, not 5-toothed ; the petals obtuse, not acute, 

 and tlie fruit is compressed, not inflated, &c. 



1 D. COSRU'LEUS (Hook. bot. FIG. 57. 



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. O- F. Native of New 

 Holland. Trachymene cyanaea, 

 Cunningh. mss. Trachymene 

 coerulea, Graham, in edinb. phil. 

 journ. 1828. Sept. p. 373. Lindl. 

 bot. reg. no. 1225. Hugelia 

 cyanae'a, Rchb. icon. exot. t. 201. 

 Flowers blue ; each umbel having 



