LX. UMBELLIFERiE. 
Ill 
2. TRACHYMENE, Rudge. 
(Alluding to the rough channels of the fruit.) 
(Didiscus, DC.; Dimetopia, DC.; Pritzelia, IValp.; Huegelia, Reich.; Cesatia, Endl.; 
Hemicarpus, F. v. M.) 
Calyx-teeth minute or inconspicuous or rarely 1 or 2 rather longer and subulate. 
Petals entire, obtuse or nearly so, much imbricate. Disk fiat or with slightly 
prominent margins or scarcely any. Fruit laterally compressed, usually flat, 
notched at the base, without vittae ; carpophore persistent, undivided ; carpels 
laterally compressed, the dorsal rib prominent, rarely winged, lateral ones con- 
cealed in the narrow commissure, intermediate ribs semicircular, shorter than the 
fruit, enclosing as it were an inner disk. Seed straight, laterally compressed. — 
Herbs either annual, biennial, or with a perennial stock, more or less hirsute or 
rarely glabrous. Leaves ternately divided or rarely toothed only, without 
stipules. Flowers white or blue, in simple umbels, on terminal or leaf- opposed 
peduncles. Involucre of linear bracts usually shortly united at the base. Fruits 
usually tubercular murieate or villous, one carpel often differently or less muricate 
than the other or abortive. 
Besides the Australian species, which are endemic, there is one from New Caledonia and one 
from Borneo. — Benth. 
Small annuals. Leaves divided. Flowers few in the umbels. Fruit equally 
covered with long ciliate bristles 1. X. cyanopetala. 
Coarse erect annuals or biennials. Leaves divided or lobed. Flowers 
numerous in the umbel. Fruit not winged. 
Involucral bracts much shorter than the pedicels. Flowers small. Leaves 
divided. Carpels both perfect or one abortive. 
More or less hirsute, not glaucous 2. T. australis. 
Very glabrous and glaucous 3. X. glaucifalia. 
Involucral bracts short. Leaves deeply 3-lobed, with oblong-cuneate lobes. 
One carpel abortive 4. X. glandulosa. 
Rootstock perennial, with elongated branching stems. Leaves deeply 
divided, both carpels usually perfect. 
Stems erect, rigid. Leaves mostly radical from the base 5. X. incisa. 
Stems weak, procumbent, leafy 6. X. procumbent. 
1. T. cyanopetala (petals blue), Benth. FI. Austr. iii. 848. Stem and 
foliage glabrous or nearly so. Leaves deeply 8 or 5-lobed, with linear or cuneate 
entire or 2 or 3-lobed divisions. Peduncles short. Involucre of 4 or 5 bracts. 
Flowers in the umbels 3 to 6, on very short pedicels. Petals blue. Fruits 
densely covered with soft ciliolate bristles, and usually dense on both carpels, 
rarely one carpel almost bare. — Dimetopia cyanopetala, F. v. M. Fragm. i. 231. 
Hab.: Darling Downs. 
2. T. australis (Australian), Benth. hi. Austr. iii. 349. Stems 14 to 2ft. 
high. Root fusiform. Petioles and leaves hairy but on the latter the hairs are 
deciduous, or the whole plant sometimes nearly glabrous. Segments of the 
cauline leaves linear. Involucre of several narrow linear bracts. Petals large, 
obovate, entire. Fruit scabrous, of 2 orbicular carpels. — Did incus pilosus, Benth. 
in Hueg. Enum. 54 ; Hook. f. FI. Tasm. i. 154 ; Hook. Ic. t. 307 ; Dimetopia 
anisocarpa and D. <j rand is, Turcz in Bull. Mosc. 1849, ii. 29 ; Duliscus aniso- 
carpus and D. grandis, F. v. M. in Proc. Roy. Soc. Tasm. iii. 238. 
Hab.: Newcastle Range, F. v. Mueller : inland localities. 
3. T. glaucifolia (leaves glaucous), Benth. hi. Austr. iii. 850; F. r. M. 
Fragm. ix. 47. Apparently an annual or biennial, the whole plant perfectly 
glabrous and, according to F. v. Mueller, glaucous-pruinose when fresh. Leaves 
shortly petiolate, deeply 3 or almost 5-lobed, with linear or cuneate entire or 
3-lobed divisions. Flowers blue. — Di-discus glaucifolius, F. v. M. in Linmea, xxv. 
395. 
Hab.: Inland localities. 
