Key to Calycadenia

View taxon page for Calycadenia

(For a list of species in Calycadenia, use the above link.)

Jepson Manual glossary definitions can be seen by moving your cursor over words underlined with dots.

1. Tack-like glands of 

peduncle 

Stalk of an individual flower borne singly, not in an inflorescence, or of an entire inflorescence, or the corresponding structure in fruit; the stalk subtending an involucre (e.g., in Asteraceae, Polygonaceae).

 bracts (0)1, terminal; central ray 

lobe 

1. A major expansion or bulge, such as on the margin of a leaf, sepal, or petal, or on the surface of an ovary. 2. The free tips of otherwise fused structures, such as sepals or petals; larger than teeth.

generally << laterals, widest at base

2. Corolla yellow; ray fruit generally rough-wrinkled

3. Plant 1–5 dm, ± slender; ray 2–2.5(3.5) mm; disk flower 1–3 ..... C. micrantha

3' Plant 2–12 dm, occasionally robust; ray (4)5–12 mm; disk flower 3–25 ..... C. truncata

2' Corolla generally white, occasionally aging ± red; ray fruit generally smooth

4. Branchlets generally many, thread-like, very flexible, ray flower (0)1(2); disk flower 1–2; ray fruit ± glabrous ..... C. hooveri

4' Branchlets, if present, coarser, ± rigid, ray flower 1–5; disk flower 4–15; ray fruit ± densely appressed-hairy

5. Tack-like glands of phyllaries and paleae generally many, variable in size; disk flower corolla 7–10 mm ..... C. spicata

5' Tack-like glands generally 0 on phyllaries and paleae; disk flower corolla 5–6 mm ..... C. villosa

1' Tack-like glands of peduncle bracts generally 2–6+, terminal and/or scattered; central ray lobe <= laterals, generally widest near or beyond middle

6. Peduncle bracts ± widely oblanceolate, central channel ± not narrowed at tip, tip ± widely rounded, tack-like glands marginal, ± uniform in size; phyllaries and paleae generally without tack-like glands ..... C. mollis

6' Peduncle bracts ± 

linear 

Elongate, with nearly parallel sides; narrower than elliptic or oblong.

or 

elliptic 

In the shape of a flattened circle or ellipse; wider than linear

to 

lanceolate 

Narrowly elongate, widest in the basal half, often tapered to an acute tip.

or club-like, central channel narrowed or 0 distally, tip 

acute 

Having a short-tapered, sharp tip, the sides convex or straight and converging at less than a right angle.

, rounded, or 

truncate 

Abruptly (not gradually) narrower or smaller at base or tip, as if cut straight across or nearly so.

, tack-like glands variable in size and position; phyllaries and paleae often with tack-like glands

7. Central lobe of ray widest at base, << and narrower than laterals ..... C. multiglandulosa

7' Central lobe of ray widest near or beyond middle, ± similar to laterals

8. Leaves all 

opposite 

1. Arranged in pairs along an axis - e.g., two leaves per node. 2. Occurring in the same rank, directly above or below, as 'stamens opposite petals'. 3. Located directly across from.

; heads in congested, 

axillary 

Pertaining to or within an axil, especially a leaf axil.

and terminal clusters, appearing 

whorled 

Arranged in groups of three or more at nodes or positions along an axis (e.g., three leaves per node).

..... C. oppositifolia

8' Leaves generally 

alternate 

1. Arranged singly, often spirally, along an axis - e.g., one leaf per node. 2. Occurring in different ranks, appearing to be between, not directly above or below, as 'stamens alternate petals'.

; heads 1 or clustered in axils, in spike-like or diffusely branched clusters, not appearing whorled

9. Stem generally 

simple 

Composed of a single part; undivided; unbranched.

or few-branched, ± rigid, main axis generally obvious; paleae (3)4–6+, receptacle cup ± bell-shaped, length ± = diam; ray flower (1)2–6, ray yellow, cream, or white, aging ± pink; disk flower (4)6–21 ..... C. fremontii

9' Stem branched, main stem axis generally 0, branches ± many, slender, flexible, generally divergent, often zigzag; paleae 3(4), receptacle cup ± 

fusiform 

Elongate, widest at the middle, tapered to both ends.

to club-shaped, length ± 2 × diam; ray flower 1(2), ray white, aging ± pink, never yellow; disk flower 2–5 ..... C. pauciflora

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