PKTROSELINUM. SISON. 
137 
or 2 tovmite leaves. FI. small, white. — Marshes and ditches, 
especially near the sea. P. VI. — VIII. Celery. 
7. Petroselinum Iloffm . 
fl. P. sativum (IIoflFm.) ; 1. tripinnate shining, leaflets of the 
lower 1. ovate-enneate trifid and toothed, of the upjier 1. ternate 
lanceolate entire. — E. B. S. 2793. — Partial involucres filiform. 
L. greenish.- — Rocks and old walls. B. VI. — VIII. Parsley. 
2. P. seyetum {Koch) ; lower 1. pinnate : leaflets nearly sessile 
ovate lobed and serrate, ujjjjer 1. entire or trifid. — Sison Sm., 
E.B. 228. — Umbels very irregular. General inv. of 1 — 2 leaves. 
Fl. whitish. St. erect, roundish, nearly leafless above, 1 — 1^ foot 
high. — Damp fields on a calcareous soil. B. VIII. IX. 
8. Trinia Iloffm . 
I. T. vulgaris (DC.); glabrous, involucres w'anting or of 1 
leaf, ridges of tbe fr. obtuse. — Pimpinella dioica Sm., E. B. 
1201). — L. tripinnate, glaucous-green; leaflets linear or filiform. 
Root crowned with the remnants of former leaves. St. branched, 
erect, 6 — 8 in. high. Plants usually dioecious. — Dry limestone 
hills, rare. P. V. VI. E. 
9. Helosciadium Koch . 
1. H. nodiflonim (Koch); st. procumbent at the base and 
rooting, 1. pinnate, leaflets ovate or ovate-lanceolate unequally 
obtusly serrate, umbels opposite to the 1. longer than their pe- 
duncles or nearly sessile. — Slum Sm., E. B. 639. — St. 1 — 2 feet 
long. — Banks of ditches and brooks. P. VIII. 
2. H. repens (Koch) ; st. j)rostrate creeping, 1. pinnate, leaflets 
roundish-ovateunequally and acutely inciso-serrate, umbels shorter 
than the peduncles. — Slum Sm., E. B. 1431 . — Scarcely more than 
a variety of the jireceding. St. quite prostrate. — Boggy meadows, 
rare. P. VII. VIII. 
3. H. inundatum (Koch) ; st. creeping, 1. pinnate, leaflets of 
the lower 1. divided into capillary segments, of the upper 1. wedge- 
sha]ied and trifid, umbels generally with 2 rays. — Slum Sm., 
E. B. 227 . — Usually wdiolly submersed except a few of the upper 
1. and the fl. which rise above the water. Partial umbels very 
small. — Ponds. P. VI. VII. 
10. Sison Linn. 
I. S. Amomum (L.). — E. B. 954. — St. erect, panicled, 2 — 3 
feet high. Lower 1. pinnate : leafl. oblong lobed cut and serrate ; 
upper 1. tbvided into narrow' segments. Partial umbels and fl. 
small. — Dampish places on a calcareous soil. B. VIII. E. S. 
