Wild Flowers of Pittsburgh

Wake-Robin, Yellow Form (Trillium erectum)

This rare greenish-yellow form of the Wake-Robin grew above the Squaw Run in Fox Chapel, where it was blooming in late April. Wake-Robins are most commonly red, but in Fox Chapel they are almost exclusively white (see pictures here and here). The odor  is described in the Flora of North America as “like a wet dog,” which is unmistakable, and accounts for another common name, Stinking Willie. It’s not a flower to sniff with delight.

Gray describes the genus and the species:

TRÍLLIUM L. WAKE ROBIN. BIRTHROOT. Sepals 3, lanceolate, spreading, herbaceous, persistent. Petals 3, larger, withering in age. Stamens б; anthers linear, on short filaments, adnate. Styles awl-shaped or slender, spreading or recurved above, persistent, stigmatic down the inner side. Seeds ovate, horizontal, several in each cell. — Low perennial herbs, with a stout and simple stem rising from a short and praemorse tuber-like rootstock, bearing at the summit a whorl of 3 ample, commonly broadly ovate, more or less ribbed but netted-veined leaves, and a terminal large flower; in spring. (Name from tree, three; all the parts being in threes.) — Monstrosities are not rare with the calyx and sometimes petals changed to leaves, or the parts of the flower increased in number.

Ovary and fruit 6-angled and more or less winged.

Flower pediceled; connective narrow, not produced; leaves subsessile.

Anthers at anthesis exceeding the stigmas.

T. eréctum L. Leaves very broadly rhombic, shortly acuminate ; peduncle (2—8 cm. long) usually more or less inclined or declínate; petals ovate to lanceolate (18-36 mm. long), brown-purple or often white or greenish or pinkish; stamens exceeding the stout distinct spreading or recurved stigmas; ovary purple; fruit ovoid, 2.5 cm. long, reddish. — Rich woods, e. Que. to Ont., southw. to Pa. and in the mts, to N. C. — Flowers ill-scented.


8 responses

  1. Pingback: Wake-Robin, White Form (Trillium erectum var. album) « Flora Pittsburghensis

  2. Pingback: Wake-Robin, White Form (Trillium erectum var. album) « Flora Pittsburghensis

  3. Timothy C. Choltco

    I have about 16 species of Trillium. I flowered many Trillium cuneatum, Trillium pusillum variety pusillum, Trillium pusillum variety virgininum, Trillium viridescens, and a solid green Trillium viridescens.

    I have the regular Trillium erectum variety erectum.


    I have the white Trillium erectum variety album.


    I have the rose Trillium erectum variety erectum forma roseum. A hybrid of the previous varieties.


    I also have a “yellow” Trillium erectum variety erectum forma aureum.


    April 26, 2011 at 1:11 pm

  4. Pingback: Wake-Robin (Trillium erectum) « Flora Pittsburghensis

  5. Pingback: Wake-Robin, White Form (Trillium erectum var. album) | Flora Pittsburghensis

  6. Pingback: Wake-Robin (Trillium erectum) | Flora Pittsburghensis

  7. Pingback: Wake-Robin (Trillium erectum), Pink Form | Flora Pittsburghensis

  8. Pingback: Wake-Robin (Trillium erectum), Red Form | Flora Pittsburghensis

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