UMBELLIFER.E. VI. DIDISCUS. VII. TRACHYMENE. 



257 



the appearance of a head of the flowers of Scabiosa Caucdsica, 

 but the flowers are on longer pedicels : pedicels, after flowering, 

 twisted inwards, bearing the fruit, which lies within the invo- 

 lucel, but erect at maturity. Fruit, when young, rather hairy, 

 but in the adult state it is covered ith minute tubercles. This 

 is one of the most showy plants of the order. 



Blue-fiowered Didiscus. Fl. July, Sept. Clt. 1827. PI. 1 

 to 2 feet. 



2 D. ALBIFLORUS (D. C. prod. 4. p. 72.) plant glabrous ; ra- 

 dical leaves on long petioles, palmate ; segments dilated at the 

 apex, cut, toothed ; cauline leaves few, small ; umbels simple, 

 on long peduncles. I/ . G. Native of New Holland, at Port 

 Jackson. Trachymene incisa, Rudg. in Lin. trans. 10. p. 300. 

 t. 21. f. 2. Fruit much compressed, beset with minute tuber- 

 cles. Petals white. 



White-Jlmvered Didiscus. Clt. 1819. PI. 1| foot. 



Cult. Sow the seed of these plants on a slight hot-bed in 

 spring, and when the plants are 2 inches high, plant them separ- 

 ately into small pots, and shift them from size to size of pots as 

 they grow. 



VII. TRACHYME'NE (from rpax^e, trachys, rough, and 

 v/iriv, hymen, a membrane ; channels of fruit). Rudge, in Lin. 

 trans. 1811. vol. 10. p. 300. Spreng. umb. spec. p. 8. Koch, 

 umb. p. 143. D. C. coll. mem. 5. p. 28. prod. 4. p. 72. Azo- 

 rfclla, Labill. nov. holl. 1. p. 74. Rich. hydr. p. 21. t. 52. f. 6. 

 but not of Lam. Azorella species, Cav. Fischera species, 

 Spreng. umb. prod. p. 27. but not of D. C. Fischera, Lag. am. 

 nat. 2. p. 93. but not of D. C. Catepha, Leschen. ined. Sie- 

 bera, Rchb. 



LIN. SYST. Pentdndria, Digynia. Margin of calyx 5-toothed. 

 Petals elliptic, entire, acutish, straight at the apex, rather valvate 

 in aestivation ; styles diverging. Fruit didymous, compressed, 

 and contracted from the sides ; mericarps gibbously convex, 

 without any vittae, 5-ribbed : the 3 dorsal ribs and their channels 

 muricated with tubercles : lateral ones marginal. Carpophore 

 undivided. Seed gibbously convex, flattish in front. Herbs or 

 subshrubs, all natives of New Holland. Umbels compound, 

 many-rayed : umbellules containing 3-12 flowers. Involucrum 

 of many leaves. This genus agrees witli Hydrocotylt; in the 

 fruit being compressed ; the rest agrees with Azorella. Poran- 

 thera of Rudge agrees with this genus in habit, but the structure 

 of the flowers is very different, and most probably belongs to 

 the order Tremandrece. 



SECT. I. PLATYME'NE (from TT\O.TVQ, platys, broad ; stems 

 compressed). D. C. prod. 4. p. 72. Plant herbaceous. Stems 

 much compressed. Leaves small, cut. 



1 T. A'NCEPS (D. C. prod. 4. p. 73.) plant glabrous, nearly 

 leafless ; stem 2-edged, branched ; leaves also at the tops of the 

 branches cut into a few fine lobes. 1. G. Native of New 

 Holland. It agrees with T. compressa in the stem being com- 

 pressed, but it is one half narrower, the leaves more finely 

 cut, the umbel more slender. The fruit has not been seen, 

 but the analogy of the herb with the following species is suffi- 

 cient to indicate its belonging to the same genus. 



Two-edged-branched Trachymene. PI. 1 foot. 



2 T. COMPRE'SSA (Spreng. umb. spec. p. 9. exclusive of the 

 Chili specimen) plant glabrous, nearly leafless ; leaves very few, 

 small, binate or ternate : upper ones linear, entire ; stem 2- 

 edged, branched. %. G. Native of New Holland, on the 

 sandy coast. Azorella compressa, Labill. nov. holl. 1. p. 75. 

 t. 101. Fruit compressed, obovate ; mericarps convex on the 

 back, 3-ribbed : ribs wrinkled from the tubercles. Involucrum 

 shorter than the pedicels. 



Compressed Trachymene. PL 1 foot. 

 VOL. in. 



SECT. II. DENDROME'NE (from Sevcpov, dendron, a tree ; in 

 reference to the species being shrubby). D. C. prod. 4. p. 73. 

 Plants shrubby. Leaves entire. 



3 T. LINEA'RIS (Spreng. umb. spec. p. 7.) plant quite gla- 

 brous, shrubby ; leaves scattered, erect, linear, subulate and acute 

 at the apex. Jj . G. Native of New Holland, at Port Jackson. 

 Sieb. pi. exsic. nov.holl.no. 126. Azorella linearifolia, Cav. 

 icon. 5. t. 485. Azorella linearifolia, Pers. ench. 1. p. 303. 

 Fruit obovate, compressed ; mericarps 3-ribbed ; ribs rough 

 from rows of tubercles. Flowers yellow. 



Zinear-leaved Trachymene. Fl. Ju. Aug. Clt. 1824. Sh. 

 1 to 2 feet, 



4 T. TE'NUIS (D. C. prod. 4. p. 73.) shrubby ; branches te- 

 rete, beset with glandular hairs at the apex ; leaves scattered, 

 spreading, linear, acute ; umbels few-flowered. ^ G. Na- 

 tive of New Holland. Branches very slender. Leaves hardly 

 | line broad, and 3-4 lines long. Umbel trifid : umbellules 

 3-5-flowered. Ribs of fruit scabrous from tubercles. Very 

 like T. ericoldes. 



Slender Trachymene. Shrub 1 foot. 



5 T. SUBVELUTINA (D. C. 1. c.) shrubby ; branches terete ; 

 leaves linear, thickish, acute, velvety from short crowded down, 

 as well as the branchlets ; umbels crowded. fj . G. Native of 

 New Holland, at Port Jackson. The leaves are almost like 

 those of T. ericoldes, but differ in being velvety and erectish. 

 Branches hardly diverging. 



Rather-velvety Trachymene. Shrub 1 foot. 



6 T. ERICOIDES (Sieb. pi. exsic. nov. holl. no. 121.) shrubby ; 

 branches rather angular, glabrous ; leaves linear, acute, spread- 

 ing ; umbels crowded, fj . G. Native of New Holland. 

 Branches numerous, spreading. Leaves a line broad, with the 

 margins hardly revolute when dried. Umbels 5-cleft : umbel- 

 lules 5-6-flowered. Fruit scabrous from tubercles on the ribs. 



Heath-like Trachymene. Shrub. 



7 T. LANCEOLA'TA (Rudge, 1. c. Spreng. syst. 1. p. 879.) 

 shrubby ; branchlets rather angular, glandular, and velvety when 

 examined by a lens ; leaves lanceolate-linear, nerved, erect ; 

 umbels crowded, many-flowered. fj . G. Native of New 

 Holland. Azorella lanceolata, Labill. nov. holl. 1. p. 74. t. 99. 

 Leaves an inch and a half long, and 2 lines broad. Leaves of 

 the involucrum the length of the umbel. Umbels 5- 8 -rayed ; 

 umbellules 8-10-flowered. Branches sometimes terminated by 

 an 8-10-flowered, simple umbel. 



Lanceolate-leaved Trachymene. Shrub 1 foot. 



8 T. MYRTIFOLIA (Sieb. pi. exsic. nov. holl. no. 1 25.) shrubby ; 

 branches rather angular, hardly glandular or puberulous, even 

 when examined by a lens : leaves oval-oblong, rather attenuated 

 at both ends ; umbels crowded, many- flowered. fj . G. Na- 

 tive of New Holland. Very nearly allied to T. lanceolata, but 

 differs in the leaves being 9-10 lines long, and 3 lines broad. 

 Umbels 8-10-rayed: umbellules 8-12-flowered. 



Myrtle-leaved Trachymene. Shrub. 



9 T. OVA'LIS (D. C. prod. 4. p. 73.) shrubby ; branches 

 densely clothed with short hairs ; leaves oval, nerved, scattered, 

 nearly sessile, hardly attenuated at either end ; umbels many- 

 flowered, crowded. Tj . G. Native of New Holland. T. ovata, 

 Spreng. umb. spec. p. 8. (exclusive of the syn. of Labill.). Sieb. 

 pi. exsic. nov. holl. no. 124. Perhaps only a variety of T. 

 myrtifblia. 



Var. ft, conferta (D. C. 1. c.) leaves and branchlets much 

 crowded. ^ . G. Native of New Holland, at Port Jackson. 

 Perhaps a proper species. 



Oval-leaved Trachymene. Shrub 1 foot. 



10 T. OVA'TA (Rudge, 1. c. but not of Spreng. nor Sieb.) 

 shrubby : branches smoothish ; leaves broadly ovate, nearly ses- 

 sile, hardly longer than broad ; umbels crowded, many-flowered. 



LI 



