1. Silique long and slender (much longer than wide).
   
2. Leaf hairs none or simple (not branched).
   
3. Without stipe (stalk) above pedicel as in Stanleya.
   
4. Calyx not urn-shaped (not Caulanthus or Streptanthus).
   
5. Generally without bracts closely subtending the inflorescence & fruits.
   
6. Siliques splitting lengthwise into two carpels (valves).
   
7. Silique without prominent beak as in Brassica.
   
8. Silique generally 4-sided or terete (rounded) in cross section.
   
9. Seeds one row per chamber (not water-cress).
   
10. Stem (cauline) leaves not clasping at base.
    
11. Siliques spreading outwardly (not refelexed).
    
12. Pedicel almost as wide as the silique.

A common naturalized, annual weed collected on campus. You have already keyed out another species in this same genus!

Unknown #2: Sunflower Family (Asteraceae) Jepson page 174

1. All corollas are strap-shaped (ligulate) each with 5 lobes (teeth).
   
2. Receptacle without chaffy bracts.
   
3. Flowers one-lipped (not Acoutia or Trixis).
   
4. Pappus of 5 short scales (not bristles).
   
5. Outer achenes enflolded by phyllaries (see old heads).

A common herbaceous, naturalized weed collected on campus.

Unknown #3: Legume Family (Fabaceae) Jepson page 577

1. Flowers papilionaceous with banner, wings & keel.
   
2. Stamens diadelphous (1 free and 9 united by filaments).
   
3. Leaves palmately trifoliate with 3 leaflets.
   
4. Involucral bracts 0 (don't confuse with stipules).
   
5. Stipules at base of leaves (stipules with dark veins).
   
6. Inflorescence composed of dense cluster of numerous flowers.
   
7. Pedicels very short (less than 1 mm).
   
8. Each inflorescence sessile at stem tip (not in successive leaf axils).
   
9. Inflorescence appearing sessile above subtending leaf and stipules.
   
10. Stipules bristle-tipped with prominent veins.
    
11. Old (wilted) flowers remaining erect (not reflexed).
    
12. Corolla pink, clearly longer than the calyx lobes.
    
13. Corolla does not become inflated as in some species.
    
14. Calyx lobes densely hairy (plumose).

A cultivated and naturalized annual, probably introduced during hydroseeding for erosion control. Collected in Escondido in a vacant field near Hwy 15 (I-15).

Unknown #4: You Must Key Out The Family!

1. A herbaceous dicot (flower parts in 5's).
   
2. Flowers perfect with radial symmetry.
   
3. Perianth in 2 whorls (with petals and sepals).
   
4. Five separate petals, 5 stamens and superior ovary.
   
5. Petals minute--you must pull sepals apart to see them.
   
6. 5 separate sepals, each with membranous (scarious) margin.
   
7. Pistil 1 with 3 minute style branches which may be stuck together.
   
8. The ovary developing into a many-seeded capsule.
   
9. Leaves entire and opposite with pinnate venation.
   
10. Leaf blade oblanceolate with petiole (not awl-shaped).
    
11. Pair of stipules at the base of leaves.

A prostrate herbaceous annual. Naturalized along roadsides and bare ground in disturbed areas. Collected on campus of Palomar College.