149 
1. B. angustifolia Koch. Erect, 1 to 9 dm. high: leaflets 5 to 9 pairs, linear to 
oblong or ovate, serrate to cut-toothed, often laciniately lobed, sometimes crenate, 
1 to7.5 cm. long: umbel many rayed ; rays 5 em. long or less; pedicels 4 to 6 mm. 
long: fruitscarcely 2mm. long. (Sium angustifolium L.)— Throughout North America, 
but not abundant. 
28. BOWLESIA Ruiz & Pav. 
Slender branching annuals, with stellate pubescence, opposite simple 
(lobed) leaves, scarious lacerate stipules, simple few-flowered umbels 
of white flowers on axillary peduncles, rather prominent calyx-teeth, 
broadly ovate stellate-pubescent fruit, the turgid carpels being nearly 
distinct and depressed on the back, no ribs or oil-tubes, and a de- 
pressed stylopodium, 
1. B. lobata Ruiz & Pavon. Weak, 5 to 60 cm. long, dichotomously branching: 
leaves thin, cordate to reniform, 12 to 25 mm. or more broad, 3 to 5-lobed (lobes entire 
or toothed), on long slender petioles: umbels 1 to 4-flowered, on short peduneles: fruit 
about 2 mm. long, sessile or nearly s0.—A species of the Mexican border, extending 
from the Gulf to California. 
29. HYDROCOTYLE L. (Water rExNywort.) 
Low herbaceous perennials, growing in or near water, with slender 
creeping stems, orbicular-peltate or reniform leaves, small white flowers 
in simple or proliferous umbels, minute or obsolete calyx-teeth, more or 
less orbicular very much laterally flattened fruit with broad or filiform 
more or less unequal ribs, depressed st ylopodium, and no distinct oil- 
tubes. 
” Leaves orbicular-peltate, crenate: peduncles as long ae the petioles, both from slender 
creeping rootstocks. 
1. H. umbellata L. Descending branches of the rootstock with round tubers: um- 
bels many-flowered, simple (sometimes proliferous) ; pedicels 4 to 12mm. long: fruit 
strongly uotched, 2 mm, long, about 3mm. broad, with dorsal ribs prominent but 
obtuse.—A species of the Atlantic States, extending through Texas into Mexico, 
2. H. prolifera Kellogg. Tuberous as in the last: umbels mostly proliferous, with 
5 to 20-flowered whorls; pedicels 2 to 6 mm. long: fruit but slightly notched, 2 mm, 
long and slightly broader, with dorsal ribs prominent and more obtuse than in the 
last. (H. interrupta T. & G.in part.)—Throughout southern Texas, 
3. H. verticillata Thunb. Umbels few-flowered, proliferous, forming an inter- 
rupted spike ; pedicels very short or none: fruit not at all notched, 2 mm. long, 3 to 
4mm, broad, with dorsal and lateral ribs very prominent, the former acute. (4. in- 
terrupta Muhl.)—Throughout Texas. 
4. H. Bonariensis Lam., var. TEXANA Coult. & Rose. Petioles and peduncles 15 
to 20 em. long: inflorescence 5 to 10 cm. long, irregularly or 3 to 5-umbellately 
branched: fruit obtuse at base, 2 mm. long, 3 mm. broad.—Collected probably along 
the southern seacoast of Texas by Mr. Nealley. 
*™* Leaves not peltate: peduncles much shorter than petioles. 
5. H. ranunculoides L. f. Usually floating: leaves thickish, round-reniform, 3 
to 7-cleft, with crenate lobes: peduncles 2.5 to 7.5 cm. long, reflexed in fruit: capi- 
tate umbel 5 to 10-flowered, the involucral bracts small or wanting: fruit 2 to 3mm. 
broad, with rather obscure ribs and no secondary ribs or reticulations. (H. natans 
Torr. & Gray.)—Extending from the Gulf States into Texas. 
6. H. Asiatica L. Smooth orsomewhat pubescent: petioles (7.5 to 10 cm. or even 
