352 LVI. UMBELLIFERA. [Siebera. ` 
slightly notched at the base, without vittæ; carpophore persistent; carpels 
h 
more or less com- 
pressed but often not filling the cavity.—Rigid herbs with a perennial almost 
woody stock and virgate branches, or heath-like shrubs, glabrous or slig 
glandular-pubescent.. Leaves all entire or the lower ones divided or 
duced to small scales, seo stipules. Umbels compound or rarely el 
terminal Involucral bracts small. Flowers small, white. Fruit small. 
The genus is confined to vens ^ a. 
Desen or undershrubs. rone leafless or the lower leaves divided, 
i e upper ones linear-sub 
Stems flattened or 2- singed, nearly leafless, Fruits broader than 
; ong $ j 1. S. compressa. 
Stems terete ‘angular or scarcely flattened. 
Stems nearly "leafless ex cept a few d small leaves at the base. 
ruits as long as broad. 
Umbels com pou E xi. uis oio eos od. PERDE 
Umbels all simple 3. S. haplosciadia. 
Stems leafless, twining, Fruits s very ‘flat, with acute edges broader ; 
han lon 4. S. cirrosd. — 
Stems diffuse, 
Lower sate divided, [upper ones subulate. Fruits broader than 
on 4, S. heterophylla. 
Leaves all or n nearly all divided. Fruits as 5 long as s broad. 
Peduncles short. Ka ea turgid at thedorsal edge, broadly SCH 
flat towards wi 5. S. femussima. 
Stems rir, erect. ës e Peduncles long, rigid. 
ane SE in og RA flat at the dorsal edge and com- Eer, 
. S. dissecta. 
e 
Shrubs ith na numerous small narrow leaves. Fruits nearly flat or with 
a broad flat fure at the commissure. Western species. 
erect, or spreading. 
Umbels very s sessile. Carpels ME and very obtuse at the 
Ue CUI tuy L7. n EEG 
Umbels on slender Musici. “Ca els slightly turgid in the ` 
middle, the dor eege d is RC 8. 8. effusa. 
Leaves closely eet Fruit of S. 4 usa 9. S. deflexa. 
Large leafy shrub. Fruits v very flat acute edges, Eastern: species 10. S. valida. 
Leafy shrubs. Carpels wholly tarsi e Kin a uarrow furrow at the 
commissure. Eastern 
rn spe 
. T narrow-linear or s wn te, pe 
eaves short, Stems short landular-pu- eT 
ibas short and “diffe, monly glandular-p “as le. 
Leaves most] l E 
quite P 21 (Ur oF more.” Stems ascending « or erect, uso y LA poner 3 
Leaves eege? shes vate, ovate | or lanceolate, all entire 8. B E 
eaves or irae all deeply 3- or 5-lobe id, ver acute, iot — 
panan punge s Eie d g : = , . 14. 8. Shep SÉ 
compressa, Benth. Stems from a Geer — gern 
but rigid, 3 to 2 ft. high, very flat and striate or more "inim 
red by 2 opposite “herbaceous wings, the whole psc her fe o and 
sometimes attaining a breadth of 2 or 8 lines; branches either 
straight or flexuose, or more numerous and di varicate. Leaves lew, 
ke kel 
wr 
