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Lomatium suksdorfii

Suksdorf's biscuit-root, Suksdorf's desert-parsley, Suksdorf's lomatium

Habit Herbs green, usually caulescent, but 1st shoot acaulous, (5–)90–200(–210) cm, glabrous; caudex branched, with persistent leaf bases weathering into chaffy, blackish, chartaceous scales sometimes exposing fibers, without persistent peduncles; taproot thick.
Leaves

arising at slightly different heights, not forming just 1 rosette, green, ternate-2–3-pinnate or quinate-2–3-pinnate;

petiole sheathing basally to entire length;

blade rhombic or widely obovate, 6–20 × 6–18 cm, surfaces glabrous;

primary leaflets much divided; ultimate segments 400–1000, linear, 10–50 × 1–5 mm, relatively narrow, crowded, confluent at base with adjacent lobe, petiolule absent, margins entire, usually not reflexed, apex acute, callus tips 0–0.1 mm, terminal segment 17–24(–27) mm;

cauline leaves 0–2, if present, with more than 5 ultimate segments.

Pseudoscapes

absent.

Peduncles

1–30 per plant, 1 per stem, ascending or erect, not inflated, 20–80 cm, exceeding leaves, 2.5–6 mm wide 1 cm below umbel, glabrous.

Umbels

4.5–8.3 cm wide in flower, 11.5–25 cm wide in fruit, rays 13–25, fertile rays 8–15, spreading, 6–11 cm in fruit, unequal, glabrous;

involucel bractlets (3–)4–7(–9), distinct, linear, to 11 mm, equaling or exceeding flowers, margins scarious, not ciliate, entire, glabrous.

Flowers

petals yellow, glabrous;

anthers yellow;

ovary and young fruit glabrous.

Fruiting pedicels

6–13 mm, shorter than fruit, spreading to erect when fruit is mature.

Mericarps

dorsiventrally compressed, linear-oblong, 20–32 × 5.8–9.5 mm, length/width ratio 2.2–2.9;

wings 2–3.2 mm wide, 45–70% of body width, paler than body;

abaxial ribs raised and narrowly winglike;

apex usually obtuse, rounded, or truncate;

oil ducts 1(–4) in intervals, 2 on commissure.

2n

= 66

Lomatium suksdorfii

Phenology Flowering Apr–May; fruiting mid Apr–mid Jul.
Habitat More or less open, dry, rocky hillsides, talus, rock outcrops, moderate to steep slopes, often with Oregon white oak or ponderosa pine.
Elevation 150–1400 m. [500–4600 ft.]
Distribution
from FNA
OR; WA
[WildflowerSearch map]
[BONAP county map]
Discussion

Lomatium suksdorfii grows in the Columbia River Gorge of Washington (Klickitat County) and Oregon (Wasco and Hood River counties). It is a large plant with very large fruits, like those of L. columbianum. Its stature is similar to L. columbianum and L. klickitatense, but its ultimate leaf segments are fewer and broader.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Source FNA vol. 13.
Parent taxa Apiaceae > Lomatium
Sibling taxa
L. ambiguum, L. andrusianum, L. anomalum, L. attenuatum, L. austiniae, L. bentonitum, L. bicolor, L. bradshawii, L. brandegeei, L. brevifolium, L. brunsfeldianum, L. californicum, L. canbyi, L. caruifolium, L. ciliolatum, L. columbianum, L. congdonii, L. cookii, L. cous, L. cusickii, L. cuspidatum, L. dasycarpum, L. depauperatum, L. dissectum, L. donnellii, L. eastwoodiae, L. engelmannii, L. erythrocarpum, L. farinosum, L. filicinum, L. foeniculaceum, L. fusiformis, L. geyeri, L. gormanii, L. graveolens, L. grayi, L. greenmanii, L. hallii, L. hendersonii, L. hooveri, L. howellii, L. idahoense, L. insulare, L. junceum, L. juniperinum, L. klickitatense, L. knokei, L. kogholiini, L. laevigatum, L. latilobum, L. leptocarpum, L. linearifolium, L. lithosolamans, L. lucidum, L. macrocarpum, L. marginatum, L. martindalei, L. minimum, L. minus, L. mohavense, L. multifidum, L. nevadense, L. nudicaule, L. nuttallii, L. observatorium, L. ochocense, L. oreganum, L. orientale, L. packardiae, L. papilioniferum, L. parryi, L. parvifolium, L. pastorale, L. peckianum, L. piperi, L. planosum, L. quintuplex, L. ravenii, L. repostum, L. rigidum, L. rollinsii, L. roneorum, L. salmoniflorum, L. sandbergii, L. scabrum, L. serpentinum, L. shevockii, L. simplex, L. stebbinsii, L. swingerae, L. tamanitchii, L. tarantuloides, L. tenuissimum, L. thompsonii, L. torreyi, L. tracyi, L. triternatum, L. tuberosum, L. utriculatum, L. vaginatum, L. watsonii
Synonyms Peucedanum suksdorfii
Name authority (S. Watson) J. M. Coulter & Rose: Contr. U.S. Natl. Herb. 7: 239. (1900)
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