*StS0?2.] 
XXXVIII. UMBELLIFERiE. 
171 
barren fl. lanceolate with a narrow involute point; of the fertile 
ovate, with a short inflected point. — Named in honour of Dr. 
C. B. Trinius, a Russian botanist, author of “ Species Grami- 
num ,” &c. 
1. T. vulgaris DC. ( common H.) ; glabrous, leaves tripinnate, 
leaflets linear filiform, involucre none or of one leaf, ribs of 
the fruit obtuse. T. glaberrima a. Hoffm. Fimpinella dioica 
L. : E. B. t. 1209. 
Limestone, rave. Near Bristol, on St. Vincent’s Rocks ; at Up- 
hill and Worle Hill, Somerset; Berry Head, Devon. Near Athboy, 
county of Meath, Ireland. It- -5, 6. — Whole herb glaucous-green, 
pale, remarkable for the narrow segments of its leaves, and its dioecious 
flowers. Root fusiform. 
8, IIelosciadium Koch. Marsh-wort. (Tab. I. f. 8.) 
Fruit broadly ovate or oblong. Carpels with 5 slender, 
prominent ribs, with single vittae between them ; carpophore 
entire. Cal. -teeth small or obsolete. Pet. ovate, obtuse with 
an apiculus. — Name: tAor, a marsh, and cnaadiov, an umbel. 
1. H. nodiflorum Koch ( procumbent M.) ; stem procumbent 
creeping, leaves pinnate, leaflets ovate or ovate-lanceolate 
unequally serrate, umbels opposite to the leaves. — a. larger 
leaflets bluntly serrate, umbeis longer than the peduncles or 
nearly sessile. Sium L. : E. B. t. 639. — /3. smaller leaflets 
acutely serrate, umbels shorter than the peduncles. Sium 
repens L. : E. B. t. 1431. 
Boggy meadows and sides of lakes and rivulets. 7J. . 7, 8. — 
Stems from 6 inches to 2 feet long. Leaflets 5 — 9. The two varieties 
often pass into each other. 
2. H. inunddtum Koch ( least M.) ; stems creeping, lower 
leaves capillaceo-multipartite, upper ones pinnatifid, umbels 
generally of 2 rays. Sison L.: E. B. t. 227. Sium Sin. 
Lakes and pools that are dried up in summer. If. 6, 7 . — Stems 
4 — 6 inches long. Leaves mostly eapillaceo-multifid, with the seg- 
ments small and lanceolate, those of the upper leaves wedge-shaped 
and trifid. Partial umbels minute, scarcely longer than their involucres. 
Univ. involucre 0. Fruit large in proportion to the size of the plant. 
9. Sison Linn. Bastard Stone-Parsley. (Tab. I. f. 9.) 
Fruit ovate. Carpels with 5 ribs, and single clavate vittce 
between them. Cal. -teeth obsolete. Pet. broadly obcordate, 
deeply notched and curved, with an inflected point. (Invo- 
lucres of few leaves : partial subdimidiate.) — Name : sizun, sig- 
nifying in Celtic a running brook ; some of the plants formerly 
placed in this genus delighting in such situations. 
